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37 Cards in this Set

  • Front
  • Back

Public IP Address

An IP address is considered public if the IP number is valid and falls outside any of the IP address ranges reserved for private uses by Internet standards

Private IP Address


Network Address Translation

NAT allows an enterprise to use private IP addresses for each host, plus a small number of public addresses.


Port Address Translation

Port address translation (PAT) is a function that allows multiple users within a private network to make use of a minimal number of IP addresses. Its basic function is to share a single IP public address between multiple clients who need to use the Internet publicly. It is an extension of network address translation (NAT).

AS Sequence

AS Seq

This is the order in which the AS chooses its path.


Path Attribute

Define information about a path or route through a network.

AS Path

Autonomous System Path

This has many subcomponents such as AS Seq

Public ASN

Public Autonomous System Number

Assigned by IANA similar to IP addresses. Public ASN are 1 - 64495

Default Route

A specific route set on the router to reach a destination.

Single Homed

Single ISP with a Single Link

Dual Homed

Two (or more) links to the internet, but with all links connecting to a single ISP

Single multihomed

Single link per ISP

Dual multihomed

Two or more links each to two or more different ISPs


Autonomous System Number

An ASN is a globally unique number used to identify an Autonomous System.


Those numbers are 1 through 65535

eBGP Multihop

This is the 5th configuration step for using loopback IP addresses with eBGP peers


The default time to live (TTL) is one and a mulltihop requires more there for the packet is dropped unless discarded.

Update Source (BGP)

The BGP update source on one router must match the IP address configured on the other router's neighbor command, and vice versa.

BGP Table

List of paths

Requirements for forming eBGP neighbors.

  • A local router's ASN must match the neighboring router's reference on that ASN
  • Router IDs cannot Match
  • If Configured, MD5 authentication must pass
  • Each router must be a part of a TCP connection with the other router

BGP Open Message

This generally performs the same functions as the EIGRP or OSPF hello messages.


The BGP process is either administratively down or awaiting the next retry attemp

The BGP process is waiting for the TCP connection to be completed


The TCP connection has been completed, but no BGP messages have been sent to the peer yet


The TCP connection exists, and a BGP open message has been sent to the peer, but the matching Open message has not yet been received from the other router


An open message has been both sent to and received from the other router. It is waiting for a BGP keepalive message to determine if a neighbor is matched


All neighbor parameters match, the neighbor relationship works, and the peers can now exchange update messages


Used to establish a neighbor relationship and exchange basic parameters, including ASN and MD5 authentication values


Sent on a periodic basis to maintain neighbor relationship.


If it does not receive a resopnce within the hold timer the neighbor is brought to a down state


Used to exchange PAs and the associated prefix/length (NLRI) that use those attributes


Network Layer Reachability Information

is the same thing as

prefix and length


Used to signal a BGP error: Typically results in a reset to the neighbor relationship


This is a discard route


This is not meant to be advertised, it's only purpose is to enable the operation of the network command

What Command

List possible default routes

show ip bgp

What Command

List possible routes per prefix

show ip bgp prefix[subnet-mask]

What Command

List routes learned from one neighbor, before any inbound filtering is applied

show ip bgp neighbors ip-address received routes

What Command

List routes learned from a specific neighbor that passed any inbound filters

show ip bgp neighbors ip-address routes

What Command

List routes advertised to a neighbor after applying outbound filtering

show ip bgp neighbors ip-address advertised-routes

What Command

List the number of prefixes per learned neighbor

show ip bgp summary