Friday's CCNA / CCNP Questions And Answers

CCNA:

What is the network mask for a Class A address?

A. 255.255.255.255

B. 255.255.255.0

C. 255.255.0.0

D. 255.0.0.0

E. /8

F. /12

G. /16

H. /24

ANSWER: D, E. 255.0.0.0 and /8 are the classful masks for Class A networks. They're the same mask, expressed in both dotted decimal (255.0.0.0) and prefix notation (/8).



BSCI:

Which of the following values does NOT have to be agreed upon between potential OSPF neighbors in order for an adjacency to be created?

A. The process number.

B. The area number.

C. The hello and dead timers.

D. The stub flag setting.

ANSWER: A. The OSPF process number is locally significant only. Routers must agree on the area number, the timers, and the stub flag setting to become neighbors.



BCMSN:

Which of the following is designed to detect unidirectional links?

A. Root Guard

B. Loop Guard

C. BackboneFast

D. UDLD

E. UplinkFast

F. BPDU Guard

ANSWER: D. UDLD, or Unidirectional Link Detection, does just that!