Routing Protocols Flashcards
What is the max hop count allowed in RIPv1?
15
Name the distance vector routing protocols
RIP, RIPv2, IGRP
2 reasons Why isn’t RIP suited to large networks?
1) Because of allowing only 15 hop counts. 2) Slow routing convergence
What 4 features does RIPv2 have that RIP doesn’t?
1) uses multicast 224.0.0.9 address, 2) Supports VLSM networks, 3) Allows for MD5 authentication, 4) supports discontiguous networks
What might you decide to configure if you had a large network with lots of subnets? And why?
Route aggregation/supernetting/summarization. It creates more efficient routing.
Name the main hybrid routing protocol
EIGRP
Name the 3 tables used in EIGRP
1) topology table, 2) neighbour table, 3) routing table
Which routing protocol uses bandwidth and delay of the line as defaults to determine best path to a network?
EIGRP
List the algorithms used by RIP,RIPv2,EIGRP to select the best path?
1) bellman-ford, 2) bellman-ford, 3) DUAL,
In EIGRP, what is a Successor route and where is it stored?
a successor route is the best route to a network and is stored in the Routing Table as well as the Topology Table.
What is a feasible successor route and how many can be stored?
feasible successor routes are back-up routes for the successor routes, if available. A maximum of 6 can be stored.
You need to translate from one routing protocol to another, what would you run on the route?
route redistrubtion
Which routing protocol uses a RIB? What does it stand for and what is it?
BGP. RIB = Routing Information Base. It akin to a routing table.
In BGP, an AS path is what?
a list of the Autonomous Systems that have to be traversed to reach a given network
BGP tells you about all networks at the end of an AS path, TRUE or FALSE?
TRUE
What is origin code attribute and which routing protocol uses it?
origin code attribute is a feature of BGP that gives you the history of how the networks at the end of an AS path were introduced to BGP.
How are neighbour tables maintained/updated?
How are Topology tables maintained/updated?
Neighbour tables - updated through the use of HELLO packets that are exchanged by all routers.
Topology Tables - updated through Link State Advertisements (or packets)
Which 4 routing protocols support IPv6?
1) EIGRPv6,
2) OSPFv3,
3) IS-IS,
4) RIPng
List the 3 benefits of using OSPF in a hierarchical design
1) decrease routing overhead
2) Speed up convergence
3) Confine network instability to single areas of the network
BGP uses the below:
1) Bakcbone Router
2) Area Border Router
3) Autonomous System Border Router (ASBR) to connect different Autonomous Systems. TRUE or FALSE?
FALSE - They’re all used by OSPF
What routing protocol uses Level 1 and Level 2 intermediate system?
IS-IS
In IS-IS, a Level 1 intermediate system does what?
Route within an Area
What’s the difference between how OSPF communicates route updates and IS-IS?
IS-IS uses Connectionless Network Service (CLNS) to delivery data packets between routers
OSPF uses IP
Name on big advantage IS-IS has over OSPF?
IS-IS doesn’t require a separate routing table for IPv6, making it more efficient in large networks.
