Glossary Description
M
MAC address（Media
Access Control address）
Standardized data link layer address that is required for every
port or device that
connects to a LAN. Other devices in the
network use these addresses to locate specific
ports in the
network and to create and update routing tables and data
structures. MAC
addresses are 6 bytes long and are controlled
by the IEEE.
MTU（Maximum
Transmission Unit）
The size in bytes of the largest packet that can be transmitted.
N
NAT（Network Address
Translator）
Mechanism for reducing the need for globally unique
IP
addresses. NAT allows an organization with addresses that are
not globally unique
to connect to the Internet by translating
those addresses into globally routable address space.
NTP Server
NTP Server is used for
synchronising the time across computer
networks.
P
POP3（Post Office Protocol
3）
POP3 is intended to
permit a workstation to dynamically access
a maildrop on a server host in a useful fashion.
PPPoE（Point-to-Point
Protocol over Ethernet）
PPPoE is a network protocol for encapsulating Point-to-
Protocol (PPP) frames inside Ethernet frames.
S
SMTP（Simple Mail
Transfer Protocol）
SMTP is an Internet standard for electronic mail (e-
transmission
SSH（Secure Shell
Protocol）
SSH is a network protocol
that allows data to be exchanged
using a secure channel between two networked devices.
SA （Security Association
SA is the establishment of shared security attributes between
two network entities to support secure communication.
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