Chapter 8

 
1:
A:

EIGRP is a distance vector protocol.

2:
A:

By default, EIGRP uses no more than 50% of the link's bandwidth, based on the bandwidth configured on the router's interface. This percentage to be changed with the command ip bandwidth-percent eigrp .

3:
A:

EIGRP and IGRP use the same formula to calculate their composite metrics, but EIGRP scales the metric by a factor of 256.

4:
A:

The four basic components of EIGRP are:

  • The Protocol Dependent Modules

  • The Reliable Transport Protocol

  • The Neighbor Discovery and Recovery Module

  • The Diffusing Update Algorithm

5:
A:

Reliable delivery means EIGRP packets are guaranteed to be delivered, and they are delivered in order. RTP uses a reliable multicast, in which received packets are acknowledged , to guarantee delivery; sequence numbers are used to ensure that they are delivered in order.

6:
A:

Sequence numbers ensure that a router is receiving the most recent route entry.

7:
A:

EIGRP uses the multicast address 224.0.0.10.

8:
A:

The packet types used by EIGRP are:

  • Hellos

  • Acknowledgments

  • Updates

  • Queries

  • Replies

9:
A:

The default EIGRP Hello interval is 5 seconds, except on some slow-speed (T1 and below) interfaces, where the default is 60 seconds.

10:
A:

The EIGRP default hold time is three times the Hello interval.

11:
A:

The neighbor table stores information about EIGRP-speaking neighbors; the topology table lists all known routes that have feasible successors.

12:
A:

The feasible distance to a destination is a router's lowest calculated distance to the destination.

13:
A:

The feasibility condition is the rule by which feasible successors are chosen for a destination. The feasibility condition is satisfied if a neighbor's advertised distance to a destination is lower than the receiving router's feasible distance to the destination. In other words, a router's neighbor meets the feasibility condition if the neighbor is metrically closer to the destination than the router. Another way to describe this is that the neighbor is "downstream" relative to the destination.

14:
A:

A feasible successor to a destination is a neighbor that satisfies the feasibility condition for that destination.

15:
A:

A successor to a destination is a feasible successor that is currently being used as the next hop to the destination.

16:
A:

A route is active on a particular router if the router has queried its neighbors for a feasible successor and has not yet received a reply from every queried neighbor. The route is passive when there are no outstanding queries.

17:
A:

A route becomes active when no feasible successor exists in its topology table.

18:
A:

An active route becomes passive when a reply has been received from every queried neighbor.

19:
A:

If a router does not receive a reply from a queried neighbor within the active time (3 minutes, by default), the route is declared stuck-in-active. A response with an infinite metric is entered on the neighbor's behalf to satisfy DUAL, and the neighbor is deleted from the neighbor table.

20:
A:

Subnetting is the practice of creating a group of subnet addresses from a single IP network address. Address aggregation is the practice of summarizing a group of network or subnet addresses with a single IP network address.



Routing TCP[s]IP (Vol. 11998)
Routing TCP[s]IP (Vol. 11998)
ISBN: N/A
EAN: N/A
Year: 2004
Pages: 224

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