Explain the difference between a classful and a classless routing protocol.

Correct Answer: Routing moves a letter or telephone call to the access layer (as in a street or telephone exchange) Switching makes the final delivery A switching decision is made on the part of the address that is not used in routing (as in the street number or last four digits of a phone number)

Correct Answer: Using multiple protocols is modular and allows changes to one protocol without affecting the others For example, if the addressing protocol is dependent on the delivery protocol, changes to one would imply changes need to be made to the other

Correct Answer: Answer: FA 16 = 250 10, CE 16 = 206 10, 12 16 = 18 10, and 34 16 = 52 10 FACE1234 16 = 2502061852 dotted decimal

Correct Answer: The last four digits are the used at the access layer to identify a particular telephone The next three numbers are used at the distribution layer to identify an exchange that services several phone numbers The area code is used at the core level for routing between different regions

Correct Answer: FF02:0000:0000:0000:0000:0000:130F:0005

Correct Answer: OSPF intra-area and interarea routes, and possibly a default route External routes from ABRs are blocked, and external routes from ASBRs are converted to N1 or N2 routes

Correct Answer: OSPF intra-area and interarea routes, and a default route External routes are not advertised into a stub area

Correct Answer: OSPF databases on routers in the same area must be identical If route summarization was allowed within an area, some routers would have specific routes and some routers would have summary routes for routes in the area If this were allowed, the databases for the area would never agree

Correct Answer: The router with the highest interface priority will be the router ID If all the interface priorities on the multi-access network are the same, the router with the highest router ID will be the DR

Correct Answer: By default, all routes are advertised into all OSPF areas This includes interarea OSPF routes and external routes that have been injected into OSPF By default, IS-IS does not advertise interarea or external routes into an area, but injects a default route