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PVC: Permanent Virtual Circuit: The software defined logical connection in a network. A
Virtual Circuit that is permanently available to the user.
RIP: Routing Information Protocol: A management protocol that ensures that all hosts in a
particular network share the same information about routing paths. In a RIP, a host computer
will send its entire routing table to another host computer every X seconds, where X is the
supply interval. The receiving host computer will in turn repeat the same process by sending
the same information to another host computer. The process is repeated until all host
computers in a given network share the same routing knowledge.
RIPv1: RIP Version 1: One of the first dynamic routing protocols introduced used in the
Internet, RIPv1 was developed to distribute network reach ability information for what is now
considered simple topologies.
RIPv2: RIP Version 2: Shares the same basic concepts and algorithms as RIPv1 with added
features such as subnet masks, authentication, external route tags, next hop addresses, and
multicasting in addition to broadcasting.
Router Mode: Router Mode is used when there is more than one PC connected to the
LAN-side Ethernet port of the ADSL device. This enables the ADSL WAN access to be shared
with multiple nodes on the LAN. Network Address Translation (NAT) is supported, so that one
WAN-side IP address can be shared among multiple LAN-side devices. DHCP is used to
serve each LAN-side device an IP address.
SNAP: Sub-Network Attachment Point.
SNMP: Simple Network Management Protocol: Used to govern network management and
monitor devices on the network. SNMP is formally described in RFC 1157.
SNR: Signal-to-Noise Ratio: Measured in decibels, SNR is a calculated ratio of signal strength
to background noise. The higher this ratio is, the better the signal quality is.
Subnet Mask: Short for Sub-Network Mask, subnet mask is a technique used by the IP
protocol to filter messages into a particular network segment, called a subnet. The subnet
mask consists of a binary pattern that is stored in the client computer, server, or router. This
pattern is compared with the incoming IP address to determine whether to accept or reject the
packet.
TCP: Transfer Control Protocol: Works together with Internet Protocol for sending data
between computers over the Internet. TCP keeps track of the packets, making sure that they
are routed efficiently.
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