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2021 Mar 400-101 exam question
Q51. Which technology is not necessary to set up a basic MPLS domain?
A. IP addressing
B. an IGP
C. LDP or TDP
D. CEF
E. a VRF
Answer: E
Explanation:
The simplest form of VRF implementation is VRF Lite. In this implementation, each router within the network participates in the virtual routing environment in a peer-based fashion. While simple to deploy and appropriate for small to medium enterprises and shared data centres, VRF Lite does not scale to the size required by global enterprises or large carriers, as there is the need to implement each VRF instance on every router, including intermediate routers. VRFs were initially introduced in combination with MPLS, but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite. Usage of VRFs without MPLS.
Reference: http://en.wikipedia.org/wiki/Virtual_routing_and_forwarding
Q52. Which statement is true comparing L2TPv3 to EoMPLS?
A. L2TPv3 requires OSPF routing, whereas EoMPLS does not.
B. EoMPLS requires BGP routing, whereas L2TPv3 does not.
C. L2TPv3 carries L2 frames inside MPLS tagged packets, whereas EoMPLS carries L2 frames inside IPv4 packets.
D. L2TPv3 carries L2 frames inside IPv4 packets, whereas EoMPLS carries L2 frames inside MPLS packets.
Answer: D
Explanation:
Ethernet-over-MPLS (EoMPLS) provides a tunneling mechanism for Ethernet traffic through an MPLS-enabled L3 core and encapsulates Ethernet protocol data units (PDUs) inside MPLS packets (using label stacking) to forward them across the MPLS network. Another technology that more or less achieves the result of AToM is L2TPV3. In the case of L2TPV3 Layer 2 frames are encapsulated into an IP packet instead of a labelled MPLS packet.
Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-3/lxvpn/configuration/guide/lesc43xbook/lesc43p2ps.html
Q53. Which two metrics are measured with active probes when PfR voice traffic optimization is in use? (Choose two.)
A. MOS
B. cost
C. jitter
D. bandwidth
Answer: A,C
Q54. Refer to the exhibit.
Which three statements about the output are true? (Choose three.)
A. An mrouter port can be learned by receiving a PIM hello packet from a multicast router.
B. This switch is configured as a multicast router.
C. Gi2/0/1 is a trunk link that connects to a multicast router.
D. An mrouter port is learned when a multicast data stream is received on that port from a multicast router.
E. This switch is not configured as a multicast router. It is configured only for IGMP snooping.
F. IGMP reports are received only on Gi2/0/1 and are never transmitted out Gi2/0/1 for VLANs 10 and 20.
Answer: A,B,C
Explanation:
In this example, the switch has been configured as a multicast router since IGMP snooping has been enabled. All mrouters can learn about other mrouters by receiving a PIM hello packet from another multicast router. Also, since two different VLANs are being used by the same port of gi 2/0/1, it must be a trunk link that connects to another multicast router.
Q55. DRAG DROP
Drag and drop each BGP attribute on the left to the matching description on the right.
Answer:
Avant-garde 400-101 exam answers:
Q56. Refer to exhibit.
The router is unreachable using telnet. Which option is solution?
A. Use an extended access list instead of standard access list.
B. The transport output telnet command must be added.
C. The VRF configuration must be completed.
D. The “vrf-also” keyword must be added to the access-class configuration.
Answer: D
Q57. Which two statements about Layer 2 Frame Prioritization bits are true? (Choose two.)
A. 802.1Q frame headers carry the CoS value in the three most-significant bits of the 2-byte Tag Control Information field.
B. ISL frame headers carry an IEEE 802.1P CoS value in the three least-significant bits of the 2-byte User field.
C. ISL frame headers carry an IEEE 802.1P CoS value in the three most-significant bits of the 1-byte User field.
D. On 802.1Q trunks, traffic in the native VLAN is carried in 802.1Q frames.
E. Only 802.1Q and ISL frame types can carry CoS information.
F. On 802.1Q trunks, traffic in the native VLAN is carried in 802.1P frames.
Answer: A,E
Q58. Refer to the exhibit.
Which statement is true?
A. BGP peer 10.1.2.3 is performing inbound filtering.
B. BGP peer 10.1.2.3 is a route reflector.
C. R1 is a route reflector, but BGP peer 10.1.2.3 is not a route reflector client.
D. R1 still needs to send an update to the BGP peer 10.1.2.3.
Answer: D
Explanation:
On R1 the routing table version (Tbl Ver) for 10.1.2.3 is 1, other routers have version 2, so it needs to send an update to the 10.1.2.3 peer.
Q59. Which two statements about route summarization are true? (Choose two.)
A. RIP, IGRP, and EIGRP can automatically summarize routing information at network address boundaries.
B. EIGRP can automatically summarize external routes.
C. The area range command can aggregate addresses on the ASBR.
D. The summary-address command under the router process configures manual summarization on RIPv2 devices.
E. The ip classless command enables classful protocols to select a default route to an unknown subnet on a network with other known subnets.
Answer: A,E
Q60. DRAG DROP
Drag and drop the BGP attribute on the left to the correct category on the right.
Answer: