Glossary
Multi-Tech Systems, Inc. RouteFinder RF850/860 User Guide (PN S000400E)
187
Port Scanning
– Attempting to find "listening" UDP or TCP ports on an IP device, and then obtaining
information about the device. Port scanning itself is not harmful, but it can be used by hackers to allow intrusion
by brute-force password guessing.
PPP (Point-to-Point Protocol)
–
An IETF standard which provides a method for transporting multi-protocol
datagrams over point-to-point links. All of the users on the Ethernet connection share a common connection, so
the Ethernet principles supporting multiple users in a LAN are combined with the principles of PPP, which
typically apply t serial connections.
PPPoE (Point-to-Point Protocol over Ethernet)
– An IETF standard which provides the ability to connect a
network of hosts over a simple bridging access device to a remote access concentrator. To provide a point-to-
point connection over Ethernet, each PPP session must learn the Ethernet address of the remote peer, as well
as establish a unique session identifier.
PPTP (Point-To-Point Tunneling Protocol)
– A protocol that allows secure remote access to corporate
networks (VPNs) over the Internet. All data sent over a PPTP connection can be encrypted and compressed,
and multiple network level protocols (TCP/IP, IPX) can be run concurrently.
Protocol
– A clearly defined and standardized sentence of commands and answers, with whose help a client
and a server can communicate. Well-known protocols and the services they provide are, for example, HTTP
(www), FTP (ftp), and NNTP (news).
Proxy (Application Gateway)
– The task of a proxy (Application Gateway) is to completely separate the
communication connections between the external network (Internet) and the internal network (LAN). There must
be no direct connection between an internal system and an external computer. The proxies work exclusively on
the application level. Firewalls that are based on proxies use a dual homed gateway that does not transfer any
IP packets. The proxies that run as specialized programs on the gateway can now receive connections for a
special protocol, process the received information at the application level, and then transfer them.
Proxy ARP
– The technique in which one machine, usually a router, answers ARP requests intended for
another machine. By "faking" its identity, the router accepts responsibility for routing packets to the "real"
destination. Proxy ARP allows a site to use a single IP address with two physical networks. Subnetting would
normally be a better solution.
Private Key
–
In public key cryptography the private key is only known to the holder, and it can be used to sign
and decrypt messages.
Proxy
– A cache server that acts as a firewall, protecting the local network. It allows an application inside the
proxy to access resources on the global Internet.
PSK (Pre Shared Key)
– A PSK password must be entered at both ends of the VPN tunnel. This password is
also called the secret. The holder of this password can establish a VPN connection to the secure network. Make
sure that this password does not reach the wrong hands and that you change the PSK password at regular
intervals.
Public Key
– In public key cryptography the public key, which is included in the certificate, can be used to verify
signatures and encrypt messages. A sample public key is shown below:
0sAQNic1Twvw7iknvNd6ieKDhd9JTu/Krbc71H4oIFd/xqKJntU8x25M
0Wbxr0gQngECdZPWHj6KeSVtMtslzXMkxDecdawoCadPtPiH/Iln23
GKUOt3fob9wBYbwdHOxPAYtNQBxNPEU9PGMxQdYp
8io72cy0duJNCXkEVvpvYvVzkmp0xVYOWYkfjiPsdhnz5FCitEh6XsC
e0ctBymLtAlWhuycVojr2JwzSqUIJXzS6QY5o5yzt
gjVIgwW1Er6jyyo2aeFLgusX0dz/OfdQ0N0AjRAmO3eknO
YLk2DPRkmUeYr3W94GRlzzP8ZoyPwdBv7hpZ0TRA9c38a
26+La8N2/TDKx+fGLfixB6Ed8X0jCmq4It7iD2d/9EWeaUZfctqaKfw==
Public key cryptography is based on two keys, a private key and a public key. Where conventional cryptography
is a one key system for both locking (encrypting) and unlocking (decrypting) a message, whereas public key
cryptography uses different keys for locking and unlocking. In public-key systems, one key can be kept private
while the other key is made public. Knowing that the public key does not reveal the private key.
PuTTY
– A simple but excellent
SSH
and
Telnet
replacement for Windows 95/98/NT that happens to be free.
Installation is simple - you download
PuTTY.exe
and store it somewhere on your system that's convenient.
