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2021 Mar 400-101 exam question
Q111. DRAG DROP
Drag and drop the BGP attribute on the left to the correct category on the right.
Answer:
Q112. Refer to the exhibit.
Which three statements about the output are true? (Choose three.)
A. This switch is currently receiving a multicast data stream that is being forwarded out VLAN 150.
B. A multicast receiver has requested to join one or more of the multicast groups.
C. Group 224.0.1.40 is a reserved address, and it should not be used for multicast user data transfer.
D. One or more multicast groups are operating in PIM dense mode.
E. One or more of the multicast data streams will be forwarded out to neighbor 10.85.20.20.
F. Group 239.192.1.1 is a reserved address, and it should not be used for multicast user data transfer.
Answer: A,B,C
Explanation:
A. VLAN 150 shows up in the outgoing interface list so those specific multicast streams are being forwarded to this VLAN.
B. A receiver has requested to receive the multicast stream associated with the multicast address of 239.192.1.1, that is why this stream appears in the mroute table.
C. The 224.0.1.40 is a reserved multicast group for cisco's Rp descovery. All cisco routers are members of this grup by default and listen to this group for Cisco RP discovery messages advertised by mapping agent even if it is not configured
Q113. Which option describes how a VTPv3 device responds when it detects a VTPv2 device on a trunk port?
A. It sends VTPv3 packets only.
B. It sends VTPv2 packets only.
C. It sends VTPv3 and VTPv2 packets.
D. It sends a special packet that contains VTPv3 and VTPv2 packet information.
Answer: C
Explanation:
When a VTP version 3 device on a trunk port receives messages from a VTP version 2 device, the VTP version 3 device sends a scaled-down version of the VLAN database on that particular trunk in a VTP version 2 format. A VTP version 3 device does not send out VTP version 2-formatted packets on a trunk port unless it first receives VTP version 2 packets on that trunk. If the VTP version 3 device does not receive VTP version 2 packets for an interval of time on the trunk port, the VTP version 3 device stops transmitting VTP version 2 packets on that trunk port. Even when a VTP version 3 device detects a VTP version 2 device on a trunk port, the VTP version 3 device continues to send VTP version 3 packets in addition to VTP version 3 device 2 packets, to allow two kinds of neighbors to coexist on the trunk. VTP version 3 sends VTP version 3 and VTP version 2 updates on VTP version 2-detected trunks.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vtp.html
Q114. Which two statements about EIGRP load balancing are true? (Choose two.)
A. EIGRP supports 6 unequal-cost paths.
B. A path can be used for load balancing only if it is a feasible successor.
C. EIGRP supports unequal-cost paths by default.
D. Any path in the EIGRP topology table can be used for unequal-cost load balancing.
E. Cisco Express Forwarding is required to load-balance across interfaces.
Answer: A,B
Q115. Which two statements about the command distance bgp 90 60 120 are true? (Choose two.)
A. Implementing the command is a Cisco best practice.
B. The external distance it sets is preferred over the internal distance.
C. The internal distance it sets is preferred over the external distance.
D. The local distance it sets may conflict with the EIGRP administrative distance.
E. The internal distance it sets may conflict with the EIGRP administrative distance.
F. The local distance it sets may conflict with the RIP administrative distance.
Answer: C,F
Explanation:
To allow the use of external, internal, and local administrative distances that could be a better route than other external, internal, or local routes to a node, use the distance bgp command in address family or router configuration mode. To return to the default values, use the no form of this command. distance bgp external-distance internal-distance local-distance no distance bgp
. Syntax Description
external-distance
Administrative distance for BGP external routes. External routes are routes for which the best path is learned from a neighbor external to the autonomous system. Accept table values are from 1 to 255. The default is 20. Routes with a distance of 255 are not installed in the routing table.
internal-distance
Administrative distance for BGP internal routes. Internal routes are those routes that are learned from another BGP entity within the same autonomous system. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table.
local-distance
Administrative distance for BGP local routes. Local routes are those networks listed with a network router configuration command, often as back doors, for that router or for networks that are being redistributed from another process. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table.
Defaults
external-distance: 20
internal-distance: 200
local-distance: 200
In this case, the internal distance is 60 and the external is 90, and the local distance is 120 (same as RIP).
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfbgp1. html#wp1113874
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Q116. What is the function of NSF?
A. forward traffic simultaneously using both supervisors
B. forward traffic based on Cisco Express Forwarding
C. provide automatic failover to back up supervisor in VSS mode
D. provide nonstop forwarding in the event of failure of one of the member supervisors
Answer: D
Q117. DRAG DROP
Drag and drop the events on the left to dispaly the correct sequence on the right when CoPP is enabled.
Answer:
Q118. Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI?
A. EPL
B. EVPL
C. EMS
D. ERMS
Answer: B
Explanation:
Ethernet Relay Service (ERS or EVPL)
An Ethernet Virtual Circuit (EVC) is used to logically connect endpoints, but multiple EVCs
could exist per single UNI. Each EVC is distinguished by 802.1q VLAN tag identification.
The ERS network acts as if the Ethernet frames have crossed a switched network, and certain control traffic is not carried between ends of the EVC. ERS is analogous to Frame Relay where the CE-VLAN tag plays the role of a Data-Link Connection Identifier (DLCI). The MEF term for this service is EVPL.
Reference: http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-1/carrier_ethernet/user/guide/l2vpn51book/concepts.html
Q119. Which two options describe two functions of a neighbor solicitation message? (Choose two.)
A. It requests the link-layer address of the target.
B. It provides its own link-layer address to the target.
C. It requests the site-local address of the target.
D. It provides its own site-local address to the target.
E. It requests the admin-local address of the target.
F. It provides its own admin-local address to the target.
Answer: A,B
Explanation:
Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node.
Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message
After receiving the neighbor solicitation message, the destination node replies by sending a neighbor advertisement message, which has a value of 136 in the Type field of the ICMP packet header, on the local link. The source address in the neighbor advertisement message is the IPv6 address of the node (more specifically, the IPv6 address of the node interface) sending the neighbor advertisement message. The destination address in the neighbor advertisement message is the IPv6 address of the node that sent the neighbor solicitation message. The data portion of the neighbor advertisement message includes the link-layer address of the node sending the neighbor advertisement message. After the source node receives the neighbor advertisement, the source node and destination node can communicate.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-neighb-disc-xe.html
Q120. DRAG DROP
Drag each show command on the left to the description of its output on a PE router on the right.
Answer: