Motorola SURFboard SBG901, Руководство пользователя

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B Glossary 123
This document is uncontrolled pending incorporation in PDM
TERM DEFINITION
stateful-inspection A type of firewall that tracks each connection, traversing all firewall
interfaces to ensure validity. In addition to examining the source and
destination in the packet header based on static rules, a stateful
inspection firewall:
•
Examines packet headers via the context established by previous
packets that traversed the firewall
•
Monitors the connection state and saves it in a table
•
Closes ports until a connection to a specific port is requested
•
May examine the packet contents up through the application layer
to determine more than just the source and destination
A stateful inspection firewall is more advanced than a static filter
firewall.
static filter
A type of firewall that examines the source and destination in the
packet header based on administrator-defined rules only.
static IP address An IP address that is permanently assigned to a host. Normally, a static
IP address must be assigned manually. The opposite of dynamic IP
address.
static route A manually-defined route.
station IEEE 802.11b term for wireless client.
subscriber A home or office user who accesses television, data, or other services
from an Internet Service provider.
subnet mask A bit mask that is logically ANDed with the destination IP address of a
packet to determine the network address. A router routes packets
using the network address.
subnetwork A part of a network; commonly abbreviated “subnet.” When
subnetting is used, the host portion of the IP address is divided into a
subnet and host number. Hosts and routers use the subnet mask to
identify the bits used for the network and subnet number.
switch On an Ethernet network, a switch filters frames based on the MAC
address, in a manner similar to a bridge. A switch is more advanced
because it can connect more than two segments.