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DG-BR4400AC User Manual

39

MTU - Please use default value if you don’t know what it is, or ask
your service provider for a proper value.

Connection Type - There are 3 options: ‘Continuous’ - keep internet
connection alive, ‘Connect on Demand’ - only connects to Internet
when there’s a connect attempt, and ‘Manual’ - only connects to
Internet when ‘Connect’ button on this page is pressed, and
disconnects when ‘Disconnect’ button is pressed.

Idle Time Out: Specify the time to shutdown internet connect after no
internet activity is detected by minute. This option is only available
when connection type is ‘Connect on Demand’.

Содержание DG-BR4400AC

Страница 1: ...0AC User Manual DG BR4400AC 802 11AC 433MBPS WIRELESS BROADBAND ROUTER User Manual V1 0 2014 04 16 As our products undergo continuous development the specifications are subject to change without prior...

Страница 2: ...their purchase the buyer and not this company its distributor or its dealer assumes the entire cost of all necessary servicing repair and any incidental or consequential damages resulting from any de...

Страница 3: ...rdance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does c...

Страница 4: ...ges or modifications not expressly approved by the party responsible for compliance could void the authority to operate equipment This device is restricted to indoor use when operated in the 5 15 to 5...

Страница 5: ...r the safety of those who install and use it However special attention must be paid to the dangers of electric shock and static electricity when working with electrical equipment All guidelines of thi...

Страница 6: ...ws Vista Windows 7 IP address setup 25 2 2 5 Windows 8 IP address setup 27 2 2 6 Router IP address lookup 29 2 3 Using Quick Setup 33 2 3 1 Setup procedure for Cable Modem 36 2 3 2 Setup procedure for...

Страница 7: ...2 7 3 1 Disable wireless security 84 2 7 3 2 WEP Wired Equivalent Privacy 85 2 7 3 3 Wi Fi Protected Access WPA 88 2 7 3 4 WPA RADIUS 90 2 7 4 Wireless Access Control 91 2 7 5 Wi Fi Protected Setup W...

Страница 8: ...9 3 4 2 Internet Connection Status 130 3 4 3 Device Status 131 3 4 4 System Log 132 3 4 5 Security Log 133 3 4 6 Active DHCP client list 134 3 4 7 Statistics 135 3 5 System Tools 136 3 5 1 Configurati...

Страница 9: ...network capabilities simultaneously all computers and wireless enabled network devices including PDA Smart phone Game console Tablet and more can connect to this wireless router without additional cab...

Страница 10: ...QoS DMZ Virtual Servers Access Control Firewall Allows you to monitor the router s status like DHCP Client Log System Log Security Log and Device Connection Status Easy to use Web based GUI for networ...

Страница 11: ...rranty will be void 5 Accessories of this router like antenna and power supply are dangerous to small children under 3 years old They may put the small parts in their nose or mouth and it could cause...

Страница 12: ...45 Ethernet port Computer or network devices with wired or wireless network interface card Web browser Microsoft Internet Explorer Google Chrome or Safari web browser An available AC power outlet 100...

Страница 13: ...ashing 5GHz Wireless LAN activity transferring or receiving data 2 4G On 2 4GHz Wireless WPS function is enabled Off 2 4GHz Wireless network is switched off Flashing 2 4GHz Wireless LAN activity trans...

Страница 14: ...de Area Network WAN Internet port Power Power connector connects to A C power adapter Reset WPS Resets the router to factory default settings clear all settings or start WPS function Press this button...

Страница 15: ...1 Build network connection Please follow the below mentioned instructions to build the network connection between your new WIRELESS router and your computers network devices 1 Connect your xDSL Cable...

Страница 16: ...DG BR4400AC User Manual 16 2 Connect all your computers network devices network enabled consumer devices other than computers like Game console or Switch Hub to the LAN port of the router...

Страница 17: ...Ds on the front panel PWR LED should be steadily on WAN and LAN LEDs should be on if the computer network device connected to the respective port of the router is powered on and correctly connected If...

Страница 18: ...procedures your computer must be able to get an IP address automatically use dynamic IP address If it s set to use static IP address or you are unsure please follow the below mentioned instructions to...

Страница 19: ...Windows 95 98 Me IP address setup 1 Click Start button it should be located at lower left corner of your computer then click control panel Double click Network icon and Network window will appear Sel...

Страница 20: ...DG BR4400AC User Manual 20 2 Select Obtain an IP address from a DHCP server and then click OK...

Страница 21: ...ton it should be located at lower left corner of your computer then click control panel Double click Network and Dial up Connections icon click Local Area Connection and Local Area Connection Properti...

Страница 22: ...DG BR4400AC User Manual 22 2 Select Obtain an IP address automatically and Obtain DNS server address automatically then click OK...

Страница 23: ...ated at lower left corner of your computer then click control panel Double click Network and Internet Connections icon click Network Connections and then double click Local Area Connection Local Area...

Страница 24: ...DG BR4400AC User Manual 24 2 Select Obtain an IP address automatically and Obtain DNS server address automatically then click OK...

Страница 25: ...at lower left corner of your computer then click control panel Click Network and Sharing Center and then click Change adapter settings Right click Local Area Connection then select Properties Local A...

Страница 26: ...DG BR4400AC User Manual 26 2 Select Obtain an IP address automatically and Obtain DNS server address automatically then click OK...

Страница 27: ...e located at lower left corner of your computer then click control panel Click Network and Sharing Center and then click Change adapter settings Right click Ethernet then select Properties Ethernet Pr...

Страница 28: ...DG BR4400AC User Manual 28 2 Select Obtain an IP address automatically and Obtain DNS server address automatically then click OK...

Страница 29: ...DG BR4400AC User Manual 29 2 2 6 Router IP address lookup After the IP address setup is complete please click start run at the bottom lower corner of your desktop Input cmd then click OK...

Страница 30: ...his example the IP address of the router is 192 168 2 1 NOTE If the IP address of the gateway is not displayed or the address followed by IP Address begins with 169 please recheck network connection b...

Страница 31: ...rom router please start your web browser and input the IP address of router in address bar The following message should be shown Please input user name and password in the field respectively default u...

Страница 32: ...n about the user name and password you typed please go to 4 2 Troubleshooting to perform a factory reset to set the password back to default value TIP This page shows the four major setting categories...

Страница 33: ...e which will help you to complete all required settings you need to access the Internet in very short time Please follow the instructions mentioned below to complete the Quick Setup Please go to Quick...

Страница 34: ...me server here Daylight Savings If the country you live in uses daylight saving please check Enable box and choose the duration of daylight saving After you finish with all the settings please click N...

Страница 35: ...rnet service provider A wrong Internet connection type will cause connection problem and you will not be able to connect to internet If you want to go back to previous step please press Back button on...

Страница 36: ...so MAC address Please input MAC address of your computer here if your service provider only permits computer with certain MAC address to access internet If you re using the computer which used to conn...

Страница 37: ...der Default Gateway Please input the IP address of default gateway provided by your service provider When you finish with all settings press OK if you want to go back to previous menu click Back NOTE...

Страница 38: ...here Service Name Please give a name to this Internet service this is optional MTU Please input the MTU value of your network connection here If you don t know you can use default value Connection Typ...

Страница 39: ...ction alive Connect on Demand only connects to Internet when there s a connect attempt and Manual only connects to Internet when Connect button on this page is pressed and disconnects when Disconnect...

Страница 40: ...how to change the time zone password and remote management settings Please start your web browser and log onto router web management interface then click General Setup button on the left or click Gen...

Страница 41: ...er If you want to enable daylight savings setting please check Enable box and set the duration of daylight setting When you finish click Apply You will see the following message displayed on the web b...

Страница 42: ...tions Please click System menu on the left of web management interface then click Password Settings and the following message will be displayed on your web browser Here is the description of every set...

Страница 43: ...urrent Password field is wrong please click OK to go back to previous menu and try to input current password again If the current and new passwords are correctly entered after you click Apply you will...

Страница 44: ...ft of web management interface then click Remote Management and the following message will be displayed on your web browser Here is the description of every setup item Item Description Host Address In...

Страница 45: ...c IP address it will not be a problem but if the IP address your service provider assigns to you will vary every time you establish an internet connection this will be a problem Please either ask your...

Страница 46: ...the left of web management interface and the following message will be displayed on your web browser Please select an Internet connection method depending on the type of connection you are using You c...

Страница 47: ...C Address Please input MAC address of your computer if your service provider only permits computer with certain MAC address to access internet If you re using the computer which used to connect to Int...

Страница 48: ...the settings will take effect Please wait for about 40 seconds while the router is rebooting 2 5 2 Setup procedure for Static IP Here is the description of every setup item Item Description IP Addres...

Страница 49: ...web browser Please click Continue to go back to previous setup menu to continue on other setup procedures or click Apply to reboot the router so the settings will take effect Please wait for about 40...

Страница 50: ...ice Name Please give a name to this Internet service this is optional MTU Please input the MTU value of your network connection here If you don t know you can use default value Connection Type Please...

Страница 51: ...you have selected the connection type to Connect On Demand please input the idle time out After you finish with all settings please click Apply button and the following message will be displayed on y...

Страница 52: ...eason you can input the IP address of DNS server here Here is the description of every setup item Item Description Primary DNS Address Please input the IP address of DNS server provided by your servic...

Страница 53: ...button 2 5 5 Setup procedure for DDNS DDNS Dynamic DNS is an IP to Hostname mapping service for those Internet users who don t have a static fixed IP address It will be a problem when such user wants...

Страница 54: ...ings will take effect Please wait for about 40 seconds while router is rebooting If you want to reset all settings in this page back to previously saved value please click Cancel button Item Descripti...

Страница 55: ...DG BR4400AC User Manual 55 2 5 6 WAN Speed It is used for setting up the WAN port speed...

Страница 56: ...static IP address set the IP address for every computer manually and dynamic IP address IP address of computers will be assigned by router automatically It s recommended for most of computers to use d...

Страница 57: ...work with up to 253 clients so you can set d field of IP address of router as 1 or 254 or any number between 1 and 254 and pick a number between 0 and 254 for field c 2 In most cases you should use 25...

Страница 58: ...network 802 1d Spanning Tree If you wish to activate 802 1d spanning tree function select Enable for setup item 802 1d Spanning Tree or set it to Disable DHCP Server If you want to activate DHCP serv...

Страница 59: ...of every IP address assigned by this router from drop down menu DHCP client Start IP Please input the start IP address of the IP range DHCP client End IP Please input the end IP address of the IP rang...

Страница 60: ...tem Item Description Enable Static DHCP Leases Check this box to enable this function otherwise uncheck it to disable this function MAC Address Input the MAC address of the computer or network device...

Страница 61: ...C address and IP address mapping then click Delete button if you want to delete all mappings click Delete All After you finish all LAN settings please click Apply button on this page After you click A...

Страница 62: ...cious intruders This router supports both 2 4GHz and 5GHz wireless bands simultaneously the wireless settings for both wireless bands are almost the same The following sections will only highlight the...

Страница 63: ...ase select Enable then click Apply button After you click Apply the following message will be displayed on your web browser Please click Continue to go back to previous setup menu to continue on other...

Страница 64: ...then click Basic Settings and the following message will be displayed on your web browser 2 4GHz Wireless 5GHz Wireless This wireless router can work in 6 modes a Access Point Standard wireless AP b...

Страница 65: ...ion mode you want to use from Mode dropdown menu and continue on other operation mode specific settings Access Point Please go to section 2 7 1 1 Station Infrastructure Please go to section 2 7 1 2 AP...

Страница 66: ...Settings 5GHz Access Point Settings Here is the description of every setup item Item Description Band Please select the radio band from one of following options 2 4GHz Band 2 4 GHz B this mode only a...

Страница 67: ...802 11n clients 5GHz Band 5GHz A this mode allows 802 11a wireless network client to connect to this router maximum transfer rate 54Mbps for 802 11a clients 5GHz N this mode allows 802 11n wireless ne...

Страница 68: ...o you like myhome office_room1 etc Channel Number Please select a channel from the dropdown list of Channel Number You can choose any channel number you want to use and almost all wireless clients can...

Страница 69: ...e same channel which will disturb the radio communication between wireless client and the wireless router NOTE For 802 11n mode The router is operating in a 2T2R Spatial Multiplexing MIMO configuratio...

Страница 70: ...ture Settings 5GHz Station Infrastructure Settings Here is the description of every setup item Item Description Band Select the band you want to use SSID This is the name of the wireless network You c...

Страница 71: ...ey re on the same physical network This function is very convenient when you need to connect two networks between two buildings Here are the instructions about how to connect two wireless routers toge...

Страница 72: ...is mode of the wireless routers will think they re on the same physical network 2 4GHz AP Bridge Point to Multi Point Settings Item Description Band Select the band you want to use Two wireless router...

Страница 73: ...want to use two wireless routers must use the same setting Channel Number Select the channel you want to use two wireless routers must use the same setting MAC address 1 to 4 Input the MAC address of...

Страница 74: ...In this mode you can expand the scope of network by combining up to four other access points together and every access point can still accept wireless clients 2 4GHz AP Bridge WDS Settings NOTE For WD...

Страница 75: ...ience of roaming Channel Number Select the channel you want to use all the wireless routers must use the same setting Associated Clients Click Show Active Clients button then an Active Wireless Client...

Страница 76: ...to a Root AP and use AP function to service all wireless stations within its coverage 2 4GHz Universal Repeater Settings 5GHz Universal Repeater Settings NOTE For Repeater Mode this router will demodu...

Страница 77: ...yhome office_room1 etc Channel Number Select the channel you want to use all the wireless clients must use the same setting Associated Clients Click Show Active Clients button then an Active Wireless...

Страница 78: ...fter you click Apply the following message will be displayed on your web browser Please click Continue to go back to previous setup menu to continue on router setup or click Apply to reboot the router...

Страница 79: ...dvanced control of wireless parameters if you want to configure these settings please click 2 4GHz Wireless or 5GHz Wireless menu on the left of web management interface then click Advanced Settings a...

Страница 80: ...t it is default value is 2346 RTS Threshold Set the RTS threshold of wireless radio Do not modify default value if you don t know what it is default value is 2347 Beacon Interval Set the beacon interv...

Страница 81: ...e the ESSID of your wireless router set the option to Disable so only people those who know the ESSID of your wireless router can get connected CTS Protect Enabling this setting will reduce the chance...

Страница 82: ...rebooting 2 7 3 Wireless Security It s very important to set wireless security settings properly If you don t hackers and malicious users can reach your network and valuable data without your consent...

Страница 83: ...data you transfer over network without your consent 2 7 3 2 WEP Wired Equivalent Privacy When you select this mode the wireless router will use WEP encryption and the following setup menu will be show...

Страница 84: ...d A Z if you select ASCII key format and if you select Hex as key format you can use characters 0 9 a f and A F Enable 802 1x Authentication IEEE 802 1x is an authentication protocol Every user must u...

Страница 85: ...haracters pilot phone 23561 2Hyux xmL ASCII 13 characters digitalFAMILY 82Jh26xHy3m n Hex 10 characters 287d2aa732 1152dabc85 Hex 26 characters 9284bcda8427c9e036f7abcd84 To improve security level do...

Страница 86: ...i Protected Access WPA When you select this mode the wireless router will use WPA encryption and the following setup menu will be shown on your web browser Here is the description of every setup item...

Страница 87: ...reboot the router so the settings will take effect Please wait for about 40 seconds while router is rebooting characters of 0 9 and a f Pre shared Key Please input the WPA passphrase here It is not re...

Страница 88: ...uite Available options are WPA TKIP WPA2 AES and WPA2 Mixed You can select one of them but you have to make sure your wireless client supports the cipher you selected RADIUS Server IP address Please i...

Страница 89: ...ccess Control This function will help you to prevent unauthorized users from connecting to your wireless router only those wireless devices who have the MAC address you assigned here can gain access t...

Страница 90: ...MAC addresses listed here please click Delete All button Enable Access Control To enforce MAC address filtering you have to check Enable Access Control When this item is unchecked wireless router wil...

Страница 91: ...e wait for about 40 seconds while router is rebooting If you want to reset all settings in this page back to previously saved value please click Cancel button alphanumerical characters here This is op...

Страница 92: ...PBC and PIN code If you want to use PBC you have to push a specific button on the wireless client to start WPS mode and switch this wireless router to WPS mode too You can push Reset WPS button of th...

Страница 93: ...h other WPS enabled wireless devices SSID The SSID of this wireless router will be displayed here Authentication Mode The wireless security authentication mode of this wireless router will be displaye...

Страница 94: ...for 2 minutes The WLAN LED on the wireless router will be steady on for 2 minutes when this wireless router is waiting for incoming WPS request Configure by client PinCode Please input the PIN code o...

Страница 95: ...member that the wireless client is capable to keep the key or passphrase for you so you only have to input the complicated key or passphrase once This will greatly improve security level 3 You can hid...

Страница 96: ...ich require guaranteed bandwidth like video streaming and network telephone will be affected therefore an unpleasing result will occur like the interruption of video audio transfer With this function...

Страница 97: ...ton to add a new QoS rule see section 3 1 2 Add a new QoS rule below Edit If you want to modify the content of a specific rule please check the select box of the rule you want to edit then click Edit...

Страница 98: ...setup procedures or click Apply to reboot the router so the settings will take effect Please wait for about 40 seconds while router is rebooting If you want to reset all settings in this page back to...

Страница 99: ...ct the type of QoS guarantee guaranteed usable bandwidth for this rule or max set the maximum bandwidth for the application allowed by this rule Local IP Address Specify the local source IP address th...

Страница 100: ...he left field to define a single IP address Remote Port Range Please input the range of remote destination port number that will be affected by this rule If you want to apply this rule on port 80 to 9...

Страница 101: ...s to every user Therefore it s necessary to use NAT technology to share a single Internet IP address to multiple computers on local network so everyone can get connected to Internet Please follow the...

Страница 102: ...2 2 Port Forwarding This function allows you to redirect a single port or consecutive ports of Internet IP address to the same port of the IP address on local network The port number s of Internet IP...

Страница 103: ...ecking the IP address of the computer Type Select the type of connection TCP or UDP If you re not sure please select Both Port Range Input the starting port number in the left field and input the endi...

Страница 104: ...ck Apply to reboot the router so the settings will take effect Please wait for about 40 seconds while router is rebooting If you want to reset all settings in this page back to previously saved value...

Страница 105: ...NAT menu on the left of web management interface then click Virtual Server and the following message will be displayed on your web browser Here is the description of every setup item Item Description...

Страница 106: ...P If you re not sure please select Both Public Port Please select the port number of Internet IP address which will be redirected to the port number of local IP address defined above Comment Please in...

Страница 107: ...ess Input the IP address of the computer which you want to open the ports Computer Name Pull down the menu and all the computers connected to the router will be listed here You can easily select the c...

Страница 108: ...t Table Reset Click Reset will clear all above setting and you can set up again Current Trigger Port All the settings for the special applications will be listed here If you want to remove some Specia...

Страница 109: ...k NAT menu on the left of web management interface then click UPnP and the following message will be displayed on your web browser There is only one option in this page please select Enable or Disable...

Страница 110: ...plications which required special support will be able to work with NAT architecture Please click NAT menu on the left of web management interface then click ALG Settings and the following message wil...

Страница 111: ...firewall function to block malicious intruders from accessing your computers on local network These functions include inbound attack prevention and block outbound traffics like block URLs which have...

Страница 112: ...for about 40 seconds while router is rebooting 3 3 1 Access Control This function allows or denies computers with specific MAC address from connecting to the network it can also allow or deny computer...

Страница 113: ...and all the computers connected to the router will be listed here You can easily select the computer name without checking the IP address of the computer Comment You can input any text here as the com...

Страница 114: ...or of IP filtering table If you select deny all IP addresses listed in filtering table will be denied from connecting to the network if you select allow only IP addresses listed in filtering table wil...

Страница 115: ...Manual 115 If you want to reset all settings in this page back to previously saved value please click Cancel button 3 3 1 1 Add PC After button is clicked the following message will be displayed on y...

Страница 116: ...define a single IP address Client PC Service Please check all services you want to allow or deny this IP address to use you can check multiple services Protocol If the service you need is not listed a...

Страница 117: ...o set URL blocking parameters Please click Firewall menu on the left of web management interface then click URL Blocking and the following message will be displayed on your web browser Here is the des...

Страница 118: ...in this page back to previously saved value please click Cancel button Keyword filtering table Reset Click Reset to remove the value you inputted in URL Keyword field Current URL Blocking Table All ex...

Страница 119: ...u Please follow the instructions mentioned below to set DoS prevention parameters Please click Firewall menu on the left of web management interface then click DoS and the following message will be di...

Страница 120: ...ore all inbound PING request but when you activate this function you will not be able to ping your own router from internet too Port Scan Some malicious intruder will try to use a port scanner to know...

Страница 121: ...activated Please check the box of Ping of Death and input the frequency of threshold how many packets per second minute or hour you can also input the Burst value which means when this number of Ping...

Страница 122: ...ncel button 3 3 4 Demilitarized Zone DMZ Demilitarized Zone DMZ refers to a special area in your local network This area resides in local network and all computers in this area uses private IP address...

Страница 123: ...put the IP address that you want to map to a specific private IP address Client PC IP address Please input the private IP address that the Internet IP address will be mapped to Computer Name Pull down...

Страница 124: ...is rebooting If you want to reset all settings in this page back to previously saved value please click Cancel button Current DMZ Table All existing public IP address and private IP address mapping w...

Страница 125: ...us The functions described here will provide you the system related information To enter system status menu please either click Status link located at the upper right corner of web management interfac...

Страница 126: ...an use this function to know the system information and firmware version of this router Please click Status link located at the upper right corner of web management interface and the following message...

Страница 127: ...se this function to know the status of current Internet connection Please click Internet Connection menu on the left of web management interface and the following message will be displayed on your web...

Страница 128: ...can use this function to know the status of your router Please click Device Status menu on the left of web management interface and the following message will be displayed on your web browser This in...

Страница 129: ...k System Log menu on the left of web management interface and the following message will be displayed on your web browser The system events will be displayed in this page and here are descriptions of...

Страница 130: ...router Please click Security Log menu on the left of web management interface and the following message will be displayed on your web browser The system events will be displayed in this page and here...

Страница 131: ...to check all active DHCP leases issued by this router Please click Active DHCP client menu on the left of web management interface and the following message will be displayed on your web browser All i...

Страница 132: ...on to check the statistics of wireless LAN and WAN interface of this router Please click Statistics menu on the left of web management interface and the following message will be displayed on your web...

Страница 133: ...ide you system tools for the all the settings backup restore firmware upgrade and resetting the router to default settings To enter system status menu please either click Tools link located at the upp...

Страница 134: ...Here is the description of every setup item Item Description Backup Settings Press Save button and you ll be prompted to download the configuration as a file default filename is config bin you can sav...

Страница 135: ...ix the bugs of this router To upgrade firmware please follow the following instructions Please click Tool located at the upper right corner of web management interface then click Firmware Upgrade on t...

Страница 136: ...cated at the upper right corner of web management interface then click Reset on the left of web management interface then the following message will be displayed on your web browser Please click Apply...

Страница 137: ...WAN Port 10 100M Port x 1 LAN Ports 10 100M Port x 4 Antenna External Dipole Antenna x 2 2 4G x 1 2 4G 5G x 1 Power DC 5V 1 5A Switching Power Adapter Dimension 30 H x 127 W x 105 D mm Weight 175 gms...

Страница 138: ...rectly powered c You must use the same IP address section which router uses d Are you using MAC or IP address filter Try to connect the router by another computer and see if it works if not please res...

Страница 139: ...hostname please check DNS setting I can t locate my router by my wireless client a Broadcast ESSID set to off b All two antennas are properly secured c Are you too far from your router Try to get clos...

Страница 140: ...ly forget the password do a hard reset Router become hot a This is not a malfunction if you can keep your hand on the router s case b If you smell something wrong or see the smoke coming out from rout...

Страница 141: ...yping Broadbandrouter com into your Internet browser the user is sent to the proper IP address The DNS server IP address used by the computers on your home network is the location of the DNS server yo...

Страница 142: ...ork mask is 11111111 11111111 11110000 00000000 It means the device s network address is 11011001 10110000 10010000 00000000 and its host ID is 00000000 00000000 00000000 00000111 This is a convenient...

Страница 143: ...5 POP3 TCP 110 H 323 TCP 1720 SNMP UCP 161 SNMP Trap UDP 162 HTTP TCP 80 PPTP TCP 1723 PC Anywhere TCP 5631 PC Anywhere UDP 5632 PPPoE Point to Point Protocol over Ethernet Point to Point Protocol is...

Страница 144: ...nreliable Datagram Protocol UDP TCP IP is the standard protocol for data transmission over the Internet Both TCP and UDP are transport layer protocol TCP performs proper error detection and error reco...

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