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2021 Mar 400-101 latest exam
Q331. A TCP/IP host is able to transmit small amounts of data (typically less than 1500 bytes), but attempts to transmit larger amounts of data hang and then time out. What is the cause of this problem?
A. A link is flapping between two intermediate devices.
B. The processor of an intermediate router is averaging 90 percent utilization.
C. A port on the switch that is connected to the TCP/IP host is duplicating traffic and sending it to a port that has a sniffer attached.
D. There is a PMTUD failure in the network path.
Answer: D
Explanation:
Sometimes, over some IP paths, a TCP/IP node can send small amounts of data (typically less than 1500 bytes) with no difficulty, but transmission attempts with larger amounts of data hang, then time out. Often this is observed as a unidirectional problem in that large data transfers succeed in one direction but fail in the other direction. This problem is likely caused by the TCP MSS value, PMTUD failure, different LAN media types, or defective links.
Reference: http://www.cisco.com/c/en/us/support/docs/additional-legacy-protocols/ms-windows-networking/13709-38.html
Q332. Which three actions are required when configuring NAT-PT? (Choose three.)
A. Enable NAT-PT globally.
B. Specify an IPv4-to-IPv6 translation.
C. Specify an IPv6-to-IPv4 translation.
D. Specify a ::/96 prefix that will map to an IPv4 address.
E. Specify a ::/48 prefix that will map to a MAC address.
F. Specify a ::/32 prefix that will map to an IPv6 address.
Answer: B,C,D
Explanation:
The detailed steps on configuring NAY-PT is found at the reference link below:
Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-nat_trnsln.html
Q333. When VRF-Lite is configured without BGP support,.which statement about the configuration of the route target and route distinguisher is true?
A. The configuration of the route target and route distinguisher is required.
B. The configuration of the route target and route distinguisher is not required.
C. The configuration of the route target is required and the configuration of the route distinguisher is not required.
D. The configuration of the route target is not required and the configuration of the route distinguisher is required.
Answer: D
Q334. Refer to the exhibit.
If OSPF is implemented on the network, which additional configuration is needed to allow traffic from host 10.4.1.15/24 to host 10.1.2.20/24?
A. A virtual link between router 2 and router 4
B. A virtual link between router 3 and router 4
C. A virtual link between router 2 and router 3
D. The current design allows traffic between the two hosts.
Answer: D
Explanation:
This specific traffic from 10.4.1.0/24 to 10.1.2.0/24 would work because this traffic crosses only over the single OSPF area of 0.0.0.1.
However, traffic from hosts on R4 to R1 would indeed need a virtual link, since area 0.0.0.2 is not connected to the backbone area of 0.0.0.0.
Q335. What are three required commands when you enable source-specific multicast for addresses in the range 233.0.0.0/8? (Choose three.)
A. ip multicast-routing
B. ip igmp version 3
C. ip pim ssm-range 233.0.0.0/8
D. ip igmp version 2
E. ip pim ssm-range default
F. set routing-options multicast ssm-groups 233.0.0.0/8
Answer: A,B,C
Rebirth 400-101 download:
Q336. Refer to the exhibit.
Which three statements about the R1 configuration are true? (Choose three.)
A. The virtual circuit identifier is 1611 and the virtual circuit is down.
B. The local label for the circuit is 4006.
C. The targeted LDP session to the remote peer is up.
D. The local label for the circuit is 1611.
E. The virtual circuit identifier is 4006 and the virtual circuit is down.
F. The circuit is using MPLS VC type 4.
Answer: A,B,C
Explanation:
The number after the vc is the identifier, which is 1611 in this case. Here, the VC status is shown as down.
As shown, the MPLS VC labels: local 4006, remote unassigned shows the local label used is 4006.
The targeted LDP session is up as verified by the “Signalling protocol: LDP, peer 172.16.12.70 up” statement in the output.
Q337. Which two statements about UDP and latency are true? (Choose two.)
A. UDP is connection oriented, so the size of a UDP stream is independent of latency.
B. UDP is connection oriented, so latency can increase the size of a UDP stream.
C. UDP is connectionless, so latency can increase the size of a UDP stream.
D. If latency decreases, throughput also decreases.
E. If latency increases, throughput also increases.
F. Latency can cause jitter on UDP connections.
Answer: C,F
Q338. Which action does route poisoning take that serves as a loop-prevention method?
A. It immediately sends routing updates with an unreachable metric to all devices.
B. It immediately sends routing updates with a metric of 255 to all devices.
C. It prohibits a router from advertising back onto the interface from which it was learned.
D. It advertises a route with an unreachable metric back onto the interface from which it was learned.
E. It poisons the route by tagging it uniquely within the network.
Answer: A
Explanation:
With route poisoning, when a router detects that one of its connected routes has failed, the router will poison the route by assigning an infinite metric to it and advertising it to neighbors.
Q339. Refer to the exhibit.
If the network switch is configured as shown, which two statements about network traffic are true? (Choose two.)
A. Traffic enters the shaper on a FIFO basis.
B. Traffic enters the shaper on a weighted fair queueing basis.
C. Drop behavior is random for traffic in excess of 6 Mbps.
D. Voice traffic is given priority until it reaches 1.5 Mbps.
E. Voice traffic is given priority until it reaches 6 Mbps.
Answer: A,D
Explanation:
A. Serial interfaces at E1 (2.048 Mbps) and below use weighted fair queueing (WFQ) by default. Other interfaces use first-in first-out (FIFO) by default.
D. Voice traffic is given priority up to 25% of the shape average value, which is 6000000, so 25% of 6 Mbps is 1.5 Mbps.
Q340. On a network using RIPng, the prefix field of a routing table entry has a value of 0:0:0:0:0:0:0:0. What does this value signify?
A. The next hop address is unknown.
B. The next hop address is a site-local address.
C. The neighboring router has IPv6 ND disabled.
D. The next hop address must be the originator of the route advertisement.
E. The associated route follows a default route out of the network.
Answer: E