Module 4: Quiz

Question 1

The Internet topology has been evolving to an increasingly prominent hierarchical structure.

True/False

Answer 1

False

Question 2

An Autonomous System operates across multiple administrative domains.

True/False

Answer 2

False

Question 3

For two ASes to form a peering agreement, they need to find common ground regarding the internal policies and traffic engineering approaches that each AS implements.

True/False

Answer 3

False

Question 4

A Content Distribution Network (CDN) or an ISP can operate over multiple Autonomous Systems.

True/False

Answer 4

True

Question 5

ISP-X has the incentive to advertise routes for C3 to Y.

True/False

Answer 5

True

Question 6

ISP-X has the incentive to advertise the routes for P’s customers to Y and Z.

True/False

Answer 6

False

Question 7

How would AS-X rank the routes learned from C3, Y, and P before deciding which one to import?

Answer 7

1) route learned from C3, 2) route learned from Y, 3) route learned from P.

Question 8

The true statements regarding the types of BGP sessions formed by routers fbetween R-A1 <-> R-A3

Answer 8

[iBGP]

Question 9

Assume that router R-D2 learns about a route to a destination in AS-A. How would R-D2 disseminate this route to R-D3 and R-D1?

Answer 9

[Using iBGP]

Question 10

Assume that router R-D2 learns about a route to an internal destination in AS-D. How would R-D2 disseminate this route to R-D3 and R-D1?

Answer 10

[Using IGP]

Question 11

Assume that router R-B1 learns about a route to AS-C. How would R-B1 disseminate this route to R-A3?

Answer 11

[Using eBGP]

Question 12

Since the BGP path selection process is fixed, an AS has no control over which routes are selected.

True/False

Answer 12

False

Question 13

AS-B can show preference to use the route heard from AS-C by assigning higher _______ value to that route.

Answer 13

[LocalPref]

Question 14

AS-B can communicate to AS-A that it prefers R-B1 as an entry point to the network, by assigning lower _______ values to these routes.

Answer 14

[MED]

Question 15

An AS can use LocalPref to control which routers are used as \_\_\_\_\_, and it can use the MED attribute to control which routers are used as \_\_\_\_\_

Answer 15

exit points, entry points

Question 16

One of the services provided by IXPs is additional security protections such as mitigation of _______.

Answer 16

DDoS (Distributed Denial of Service) attacks

Question 17

There are no costs involved for an AS to participate at an IXP.

True/False

Answer 17

False

Question 18

Since local traffic stays local at IXPs, the IXP infrastructures deal with limited volumes of traffic.

True/False

Answer 18

False

Question 19

When a large provider or Content Delivery Network joins an IXP, this can act as an incentive for other networks to join as well.

True/False

Answer 19

True

Question 20

At an IXP, the members have the choice to peer privately or publicly.

True/False

Answer 20

True

Question 21

IXPs leading incentive to establish route servers was to charge the participants for using it.

True/False

Answer 21

False

Question 22

An IXP route server does not need to run the BGP protocol to facilitate the establishment of multi-lateral peering sessions.

True/False

Answer 22

False

Question 23

For multi-lateral BGP peering sessions at an IXP, the participants have the choice to advertise routes, either directly to other participants, or to the route server.

True/False

Answer 23

False