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QUESTION 1
BFD for OSPF refers to the association of BFD with OSPF to speed up OSPF’s response to network topology changes. The OSPF neighbor
relationship can enter the Full state only after the BFD session goes up. The OSPF neighbor relationship can go down only after the BFD session goes
down.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 2
On a stable network that requires fast route convergence, you can change the value of the interval at which OSPF LSAs are received to 0 so that
topology or route changes can be detected immediately, which speeds up route convergence.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 3
To protect a device against the attacks of forged BGP messages, you can configure GTSM to check whether the TTL value in the IP message header
is within the specified range. If the peer x.x.x.x valid-ttl-hops 100 command is configured on a device, the valid TTL value range of the detected
message is [155, 255].
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 4
To reduce the possibility of attacks on BGP, use keychain authentication between BGP peers. The keychain algorithm generates a set of passwords.
Keychain authentication allows password to be automatically changed based on the configuration. Therefore, keychain authentication applies to
networks requiring high security.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 5
The first word in the output of the display version | begin uptime command run on a router is uptime.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 6
An advanced ACL defines rules based on information such as the source IP address, destination IP address, IP protocol type, TCP source/destination
port number, and UDP source/destination port number. You can use a routing policy to invoke an advanced ACL to implement BGP route control.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 7
When creating an IPv6 static route with a broadcast interface as the outbound interface, you need to specify a next hop. For point-to-point interface,
you must specify an outbound interface.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 8
There are multiple types of MAC address entries on a switch. Which of the following entries are manually configured and cannot be aged out?
A. Blackhole MAC address entries
B. Static MAC address entries
C. MUX MAC address entries
D. Dynamic MAC address entries
Correct Answer: AB
QUESTION 9
An interface of a switch is in error-down state. A possible cause is that the average rate of broadcast packets received by the interface exceeds the
upper threshold set by the administrator for storm control.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 10
When the administrator configures traffic suppression on a switch, which of the following types of packets can be suppressed based on the bit rate in
the VLAN view of the switch?
A. Unknown multicast packets
B. Broadcast packets
C. Unknown unicast packets
D. Known unicast packets
Correct Answer: B
QUESTION 11
On an MPLS network where LDP is used to establish LSPs, a transit node directly connected to the ingress node that sends a label request distributes
labels to the ingress node only after receiving a label mapping message from the egress node. In this case, which of the following is the correct
combination of the label advertisement mode and label distribution control mode?
A. DoD + ordered
B. DoD + independent
C. DU + ordered
D. DU + independent
Correct Answer: D
QUESTION 12
On an MPLS network, if the value of the S field in an MPLS packet received by the egress node is_________ , the label is at the bottom of the stack and
the egress node forwards the packet over an Ip route. (Enter only digits.)
Correct Answer: 1
QUESTION 13
If end-to-end QoS is configured on an MPLS network, the penultimate hop device on the MPLS network can pop MPLS labels from packets based on
penultimate hop popping (PHP), so that the egress node can process packets based on the QoS priority in inner packets.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 14
For high reliability purposes, the following LDP messages are transmitted through TCP: discovery messages, session messages, advertisement
messages, and notification messages.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 15
LDP sessions have been established between three devices on an MPLS network. Which of the following operations will cause the local LDP session to be re-established?
A. Configure PHP.
B. Specify the TTL mode for MPLS.
C. Change the LDP transport address.
D. Change the label advertisement mode.
Correct Answer: CD
QUESTION 16
On an MPLS network, if the penultimate LSR receives a packet carrying a label with the value ______ ，it pops the label and forwards the packet to the
last hop. (Enter only digits.)
Correct Answer: 3
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