Thursday, July 27, 2006

Here are the answers to Wednesday morning's CCNA and CCNP practice questions!


Regarding access control lists, what is true of the term implicit deny?

A. If traffic isn't expressly permitted, it is implicitly denied.

B. Only standard ACLs end with an implicit deny.

C. ACLs containing only deny statements will not have an implicit deny.

D. All ACLs end with an implicit deny.

Answer: A, D. For traffic to be permitted, it must match a permit statement in the ACL, or the implicit deny will deny it.


After the initial exchange of LSAs, an OSPF router sends LSAs after detecting or being informed of a change in the network topology. Is there another time an OSPF-enabled router will send LSAs?

A. No.

B. Yes, every 30 minutes.

C. Yes. Depending on the network type, an OSPF router will send LSAs along with its Hello.

D. Yes, every 90 seconds.

Answer: B. OSPF-enabled routers send updates at three different times. First, upon first creating an adjacency with a new neighbor, the router will advertise all its links. Second, when a change is detected in the network topology, the router will advertise the affected LSAs only. Third, an OSPF router will send LSAs every 30 minutes.


Identify the true statements regarding CoS.

A. CoS is as L2 QoS value.

B. CoS is an L3 QoS value.

C. CoS can be assigned as data is switched from one port to another on the same switch.

D. CoS can be assigned as frames are sent across a trunk.

Answer: A, C. CoS is an L2 QoS value that can be assigned as frames are prepared to cross a trunk.


Identify the PRI linecode types.

A. b8zs

B. hdb3

C. t1

D. e1

E. sf

F. esf

G. ami

H. crc4

Answer: A, B, G. The PRI linecode types are b8zs, ami, and hdb3.


Examine the following partial output of show interface serial0.

R1#show interface serial0
Serial0 is down, line protocol is down
Hardware is HD64570
Internet address is
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, reliability 250/255, txload 1/255, rxload 1/255
Encapsulation FRAME-RELAY, loopback not set
Keepalive set (10 sec)

What is the most likely cause of the current issue?

A. The keepalive timer doesn't match the remote device.

B. The encapsulation type doesn't match the remote device.

C. The serial port is shut down.

D. The cable is disconnected from the serial port.

E. The frame mapping statements haven't been written and Inverse ARP has been turned off.

Answer: D. With both the physical and logical states of the interface showing as down, the cable being loose is the most likely culprit. If the keepalive were the problem, the physical interface would show as up; if the port were shut down, the physical interface would show as administratively down.

See you later tonight with more Cisco certification exam practice questions and answers!

To your Cisco certification success,

Chris Bryant
CCIE #12933

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