Tuesday, January 27, 2009

Here are the answers to Monday's Cisco practice exam questions!

CCNA And CCENT Certification:

How many wires actually "cross over" in a crossover cable?

A. zero

B. two

C. four

D. eight

Answer: C (two pairs of wires cross)

CCNA Voice:

Short answer: As it relates to the number of channels and their use, describe the basic difference between T1 CCS and T1 CAS.

T1 CAS (Channel Associated Signaling): 24 16-kbps channels, in-band signaling

T1 CCS (Common Channel Signaling): 23 16-kbps channels, uses 64kbps for signaling (again, a D-channel)

CCNP Certification / BSCI Exam:

What interface types are assigned the following OSPF costs if left at their default speeds? (Answers have been posted after the original choices)

A. 1785 - 56 k line

B. 10 - Ethernet

C. 6 - 16 MBPS token ring (thankfully, a bit of an obscure cost)

D. 1 - FDDI, Fast Ethernet

CCNP Certification / BCMSN Exam:

Short answer: Name the two available UDLD modes and briefly describe the operation of each.

Answer: UDLD has two modes of operation, normal and aggressive. When a unidirectional link is detected in normal mode, UDLD generates a syslog message but does not shut the port down. In aggressive mode, the port will be put into error disabled state ("err-disabled") after eight UDLD messages receive no echo from the remote switch.

CCNP Certification / ISCW Exam & CCNA Security:

Identify the DHCP Snooping defaults.

A. Ports are trusted by default.

B. Ports are untrusted by default.

C. An untrusted port that receives a DHCP Offer will shut itself down.

D. An untrusted port that received a DHCP Offer will trigger an SNMP trap, but will remain available for the connected host to use.

Answers: B, C.

More questions later today, along with at least one new Cisco Certification Video Quiz!

To your success,

Chris Bryant
CCIE #12933

No comments:

Blog Archive