484
The definition of Circuit ID in the switch is 4 bytes in length and the format is "vlan_id" "module_id" "port_no". The
parameter of "vlan_id" is the first two bytes represent the VLAN ID. The parameter of "port_no" is the fourth byte and it
means the port number.
The Remote ID is 6 bytes in length, and the value is equal the DHCP relay agents MAC address.
DHCP Snooping
DHCP Snooping is used to block intruder on the untrusted ports of the switch device when it tries to intervene by
injecting a bogus DHCP reply packet to a legitimate conversation between the DHCP client and server.
DNS
DNS is an acronym for
D
omain
N
ame
S
ystem. It stores and associates many types of information with domain names.
Most importantly, DNS translates human-friendly domain names and computer hostnames into computer-friendly IP
addresses. For example, the domain name www.example.com might translate to 192.168.0.1.
DoS
DoS is an acronym for
D
enial of
S
ervice. In a denial-of-service (DoS) attack, an attacker attempts to prevent legitimate
users from accessing information or services. By targeting at network sites or network connection, an attacker may be
able to prevent network users from accessing email, web sites, online accounts (banking, etc.), or other services that
rely on the affected computer.
Dotted Decimal Notation
Dotted Decimal Notation refers to a method of writing IP addresses using decimal numbers and dots as separators
between octets.
An IPv4 dotted decimal address has the form x.y.z.w, where x, y, z, and w are decimal numbers between 0 and 255.
DSCP
DSCP is an acronym for
D
ifferentiated
S
ervices
C
ode
P
oint. It is a field in the header of IP packets for packet
classification purposes.
E
EEE
EEE is an abbreviation for Energy Efficient Ethernet defined in IEEE 802.3az.
EPS
EPS is an abbreviation for Ethernet Protection Switching defined in ITU/T G.8031.
Ethernet Type
Ethernet Type, or EtherType, is a field in the Ethernet MAC header, defined by the Ethernet networking standard. It is
used to indicate which protocol is being transported in an Ethernet frame.
F
Содержание IFS NS3550-24T/4S
Страница 1: ...P N 1072569 REV 00 05 ISS 11OCT12 IFS NS3550 24T 4S User Manual ...
Страница 37: ...User s Manual of NS3550 24T 4S 37 ...
Страница 96: ...96 Figure 4 4 6 Port Mirror Configuration Page Screenshot ...
Страница 127: ...User s Manual of NS3550 24T 4S 127 Figure 4 6 10 Port 1 Port 6 VLAN Configuration ...
Страница 151: ...User s Manual of NS3550 24T 4S 151 Figure 4 8 1 Multicast Service Figure 4 8 2 Multicast Flooding ...
Страница 184: ...184 Figure 4 9 14 Voice VLAN Configuration Page Screenshot ...
Страница 204: ...204 Figure 4 11 4 Network Access Server Configuration Page Screenshot ...
Страница 234: ...234 Figure 4 12 1 Port Limit Control Configuration Overview Page Screenshot ...
Страница 250: ...250 Click to undo any changes made locally and revert to previously saved values ...
Страница 297: ...User s Manual of NS3550 24T 4S 297 ...
Страница 388: ...388 Example Show RADIUS statistics SWITCH security aaa statistics ...
Страница 410: ...410 Parameters vid VLAN ID 1 4095 Default Setting disable ...
Страница 441: ...User s Manual of NS3550 24T 4S 441 Example Enable the mirror mode for port 1 4 SWITCH mirror mode 1 4 enable ...