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CCNA2_Ch4_Guide - SEMESTER 2 Chapter 4 Distance Vector...

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SEMESTER 2 Chapter 4 Distance Vector Routing Protocols V 4.0 4.1.1 What are the three distance vector routing protocols? RIP, IGRP, EIGRP What are the key characteristics of RIP? Hop count is used as the metric for path selection. If the hop count for a network is greater than 15, RIP cannot supply a route to that network. Routing updates are broadcast or multicast every 30 seconds, by default. What are the key characteristics of IGRP? Bandwidth, delay, load and reliability are used to create a composite metric. Routing updates are broadcast every 90 seconds, by default. IGRP is the predecessor of EIGRP and is now obsolete. What are the key characteristics of EIGRP? It can perform unequal cost load balancing. It uses Diffusing Update Algorithm (DUAL) to calculate the shortest path. There are no periodic updates as with RIP and IGRP. Routing updates are sent only when there is a change in the topology. 4.1.2 How are distance vector routes advertised? As vectors of distance and direction Does a router in a distance vector network have knowledge of the entire path to a destination network? No What are the 2 things a distance vector router knows? The direction or interface in which packets should be forwarded and The distance or how far it is to the destination network What are the two reasons sending an entire routing table in an update inefficient? consume bandwidth but also consume router CPU resources to process the updates What is the periodic update time for RIP? 30 Sec What is the periodic update time for IGRP? 90 Sec What is the address for broadcast updates? 4.1.3 What is the algorithm used for? to calculate the best paths and then send that information to the neighbors What processes does the routing protocol define? Mechanism for sending and receiving routing information. Mechanism for calculating the best paths and installing routes in the routing table. Mechanism for detecting and reacting to topology changes.
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4.1.4 Define Time to Convergence. Time to convergence defines how quickly the routers in the network topology share routing information and reach a state of consistent knowledge. The faster the convergence, the more preferable the protocol. Routing loops can occur when inconsistent routing tables are not updated due to slow convergence in a changing network. Define Scalability. Scalability defines how large a network can become based on the routing protocol that is deployed. The larger the network is, the more scalable the routing protocol needs to be. Define Classless (Use of VLSM) or Classful. Classless routing protocols include the subnet mask in the updates. This feature supports the use of Variable Length Subnet Masking (VLSM) and better route summarization. Classful routing protocols do not include the subnet mask and cannot support VLSM.
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