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Routing Midterm > Chapter 2-7 Dynamic Routing Protocols > Flashcards

Chapter 2-7 Dynamic Routing Protocols Flashcards

1
Q

What are four [4] routing protocol functions

A
  1. Discovery of remote networks
  2. Maintaining up-to-date routing info
  3. Choosing the best path to destination networks
  4. Discover new best path if current path disrupted
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2
Q

What are three [3] “pros” for routing protocol functions

A
  1. Automatic! Little maintenance and admin overhead required
  2. Calculate best path
  3. Help admins manage static routes
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3
Q

What are four [4] “cons” for routing protocol functions

A
  1. CPU and memory usage can be high
  2. Network bandwidth usage
  3. Less secure- chats w/ each other can be intercepted
  4. Experienced admins required
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4
Q

What is convergence?

A

When all routers have complete and accurate info about the entire network

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5
Q

What is convergence time?

A
  1. Convergence time = time it takes to achieve convergence

2. Is a function of update frequency and time for algorithm calculation

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6
Q

What is IGP? (Interior Gateway Protocol)

A

Used for routing WITHIN an autonomous system (RIP, EIGRP, OSPF, IS-IS)

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7
Q

What is EGP? (Exterior Gateway Protocol)

A

Used for routing BETWEEN autonomous system (BGP)

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8
Q

What is DV (Distance Vectoring) ?

A

protocols use limited pointers to distance networks

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9
Q

What is LS (Link State) ?

A

LS protocols have complete knowledge of entire network and all routers have the same map

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10
Q

What are two [2] link state protocols?

A
  1. OSPF (Open Shortest Path First)

2. IS-IS (intermediate System to Intermediate System)

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11
Q

What is a Classful Routing Protocols?

A

Classful routing protocols do not send subnet masks in their routing updates

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12
Q

What are three [3] issues with Classful Routing Protocols?

A
  1. Only RIPv1 and IGRP are classful
  2. Do not support VLSM and CIDR
  3. Create problems with discontiguous networks
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13
Q

What is a Classless Routing Protocols?

A

Classless routing protocols include subnet masks in routing updates

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14
Q

What are three [3] “Pros” for Classless Routing Protocols?

A
  1. RIPv2, EIGRP, OSPF and IS-IS
  2. Support VLSM and CIDR
  3. IPv6 routing protocols
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15
Q

What is a Metric Routing Protocol?

A

Metric = value assigned by the routing protocol to measure routes

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16
Q

What are two [2] reason matric Routing Protocol are used?

A
  1. Best path based on the route with the lowest cost

2. Lower is better!

17
Q

What are eight [8] Distance Vector Technologies?

A
  1. Share updates between neighbours
  2. Not aware of the network topology
  3. Send periodic broadcast updates even if topology has not changed
  4. Updates use bandwidth and resources
  5. IPv2 and EIGRP use multicasts
  6. EIGRP uses triggered update only
  7. RIP – Bellman-Ford algorithm
  8. IGRP and EIGRP use the Diffusing Update Algorithm (DUAL)
18
Q

What is RIP (Routing Information Protocol)?

A

distance-vector routing protocols, which employs the hop count as a routing metric.

19
Q

What is RIP (Routing Information Protocol) maximum hop count?

A

15

20
Q

What are three [3] Algorithms

A
  1. Bellman-Ford
  2. DAUL (Diffusing Update ALgorithm)
  3. Dijkstra (SPF)
21
Q

What is EIGRP (Enhanced Interior-Gateway Routing Protocol)

A

an advanced distance-vector routing protocol that is used on a computer network to help automate routing decisions and configuration. The protocol was designed by Cisco Systems as a proprietary protocol, available only on Cisco routers, but Cisco converted it to an open standard in 2013.

22
Q

What are five [5] LS Protocols Converge

A
  1. Each router learns about its own directly connected networks
  2. Routers exchange hello packets to “meet” other connected routers
  3. Each router builds its own Link State Packets(LSPs)
  4. LSPs are flooded to all neighbours who store and forward them
  5. Once all routers have received all LSPs. The routers construct a topological map which is used to determine the best routes
23
Q

What is Level 1 routing table structure?

A

Cisco routing table is hierarchical (speeds up look up process)

Routing Midterm (8 decks)

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