Route Selection (obj 2.1)

Question 1

What determines the path in route selection?

Answer 1

Traffic across routers

The flow of data through the network influences which routes are chosen.

Question 2

What is Administrative Distance (AD)?

Answer 2

An index of believability used by routers

It helps routers determine which routing protocol to trust more.

Question 3

What does a lower Administrative Distance value indicate?

Answer 3

More believable

Routers prefer routes with lower AD values.

Question 4

What is the Administrative Distance of directly connected routes?

Answer 4

0

This is considered the most believable route.

Question 5

List the Administrative Distances for the following routing protocols: Static, EIGRP, OSPF, RIP, External EIGRP, Unknown.

Answer 5

• Static – 1
• EIGRP – 90
• OSPF – 110
• RIP – 120
• External EIGRP – 170
• Unknown/Unbelievable – 255

These values indicate the trustworthiness of each protocol.

Question 6

What factors are considered in metrics for route selection?

Answer 6

• Hop count
• Believability
• Reliability
• Bandwidth
• Delay
• Costs
• Other metrics

Each routing protocol may prioritize these factors differently.

Question 7

How do routing protocols determine which route to use?

Answer 7

Each protocol will use a different metric based on its programming

Lower numbers are generally preferred.

Question 8

What type of routing protocol is RIP?

Answer 8

Distance vector

It is classified as an interior routing protocol.

Question 9

What type of routing protocol is OSPF?

Answer 9

Link state

OSPF is also an interior routing protocol.

Question 10

What type of routing protocol is EIGRP?

Answer 10

Advanced distance vector

EIGRP is categorized as an interior routing protocol.

Question 11

What type of routing protocol is IS-IS?

Answer 11

Link state

IS-IS operates as an interior routing protocol.

Question 12

What type of routing protocol is BGP?

Answer 12

Path vector

BGP is classified as an exterior routing protocol.

Question 13

What allows a network to support more than one routing protocol?

Answer 13

Route redistribution

This enables a router to participate in different protocols on different interfaces.

Question 14

Can a router participate in OSPF on one interface and EIGRP on another?

Answer 14

Yes

The router can translate between protocols for redistribution.