Exam A
QUESTION 1
Which of these statements about penultimate hop popping are true? (Choose three)
A. It is used only for directly connected subnets or aggregate routes
B. It can only be used with LDP.
C. It is only used when two or more labels are stacked.
D. It enables the Edge LSR to request a label pop operation from Its upstream neighbors
E. It is requested through TDP using a special label value that is also called the implicit-null value.
F. It is requested through LDP using a special label value that is also called the implicit-null value.
Correct Answer: ADF
QUESTION 2
Refer to the exhibit. R4 is a remote office router that is running EIGRP; the decision has been made to change EIGRP to use static EIGRP adjacencies. However, once the configuration change was applied, the adjacency between R4 and 209.165.202.139 (HQ) seems to disappear. What could be the cause of this issue?
A. Static EIGRP neighbor configuration is symmetric; it causes the interface to stop processing inbound multicast packets and stop sending multicast packets.
B. Static EIGRP neighbors are not displayed with the show ip eigrp neighbors command.
C. A distance (internal 90 or external 170) must also be configured for the static neighbor.
D. The neighbor 209.165.202.139 should be changed to run under EIGRP autonomous system 0.
Correct Answer: A
QUESTION 3
Which standard supports multiple instances of spanning tree?
A. 802.1 D
B. 802.1s
C. 802.1w
D. 802.1 z
Correct Answer: B
QUESTION 4
Which of these statements about PIM join messages in classic PIM-SM is correct?
A. PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.
B. Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.
C. PIM join messages are only sent when the multicast distribution tree is first being established.
D. PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.
Correct Answer: A
QUESTION 5
While you are troubleshooting network performance issues, you notice that a switch is periodically flooding all unicast traffic. Further investigation reveals that periodically the switch is also having spikes in CPU utilization, causing the MAC address table to be flushed and relearned. What is the most likely cause of this issue?
A. a routing protocol that is flooding updates
B. a flapping port that is generating BPDUs with the TCN bit set
C. STP is not running on the switch
D. a user that is downloading the output of the show-tech command
E. a corrupted switch CAM table
Correct Answer: B
QUESTION 6
Your network is suffering from regular outages. After troubleshooting, you learn that the transmit lead of a fiber uplink was damaged. Which two features can prevent the same issues in the future? (Choose two.)
A. root guard
B. loop guard
C. BPDU guard
D. UDLD
E. BPDU skew detection
Correct Answer: BD
QUESTION 7
In PIM-SM what control plane signaling must a multicast source perform before it begins to send multicast traffic to a group?
A. The source must send a PIM Register message to the rendezvous point (RP).
B. The source must first join the multicast group using IGMP before sending.
C. The source must perform a Request to Send (RTS) and Clear to Send (CTS) handshake with the PIM designated router (DR).
D. No control plane signaling needs to be performed; the source can simply begin sending on the local subnet.
Correct Answer: D
QUESTION 8
Refer to the exhibit. What can be done to remove the summary routes to Null0 on R3?
A. Configure the EIGRP routing subcommand no auto-summary on 209.165.202.155.
B. Configure the EIGRP routing subcommand no auto-summary on 209.165.202.24.
C. Configure the EIGRP routing subcommand no auto-summary on both 209.165.202.155 and
209.165.202.242.
D. Configure the EIGRP routing subcommand no auto-summary on R3.
Correct Answer: D
QUESTION 9
Refer to the exhibit. R4 is configured as a receive-only EIGRP stub, and is adjacent with 209.165.202.139 (R3). However, R4 is not learning about network 209.165.201.0/27 from R3. What could be the cause of this issue?
A. R4 should learn this route from 209.165.200.242, and not from R3.
B. R3 is configured as a receive-only EIGRP stub.
C. R3 and R4 may be using different EIGRP process numbers.
D. R3 and R4 are asymmetrically adjacent neighbors.
Correct Answer: B
QUESTION 10
Refer to the exhibit. Which switching feature is being tested?
A. loop guard
B. PortFast
C. root guard
D. BDPU guard
Correct Answer: A