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2021 Dec ccie 400 101:
Q331. Which two statements about RSTP and MSTP BPDUs are true? (Choose two.)
A. MSTP switches can detect boundary ports when they receive RSTP version 2 BPDUs.
B. MSTP switches can detect boundary ports when they receive RSTP version 1 BPDUs.
C. RSTP switches can process MSTP version 3 BPDUs.
D. When all boundary switches are running RSTP, MST sends only version 0 configuration BPDUs.
Answer: A,C
Explanation:
A switch running both MSTP and RSTP supports a built-in protocol migration mechanism that enables it to interoperate with legacy 802.1D switches. If this switch receives a legacy 802.1D configuration BPDU (a BPDU with the protocol version set to 0), it sends only 802.1D BPDUs on that port. An MST switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (version 3) associated with a different region, or an RST BPDU (version 2).
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_9_ea1/configuration/guide/scg/swmstp.html
Q332. Refer to the exhibit.
What is wrong with the configuration of this tunnel interface?
A. ISATAP tunnels cannot use the EUI-64 address format.
B. No tunnel destination has been specified.
C. The tunnel source of an ISATAP tunnel must always point to a loopback interface.
D. Router advertisements are disabled on this tunnel interface.
Answer: D
Explanation:
Sending of IPv6 router advertisements is disabled by default on tunnel interfaces. This command reenables the sending of IPv6 router advertisements to allow client autoconfiguration:
Example: Router(config-if)# no ipv6 nd ra suppress
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-book/ip6-isatap-xe.html
Q333. Which two statements about MPLS VPNs are true? (Choose two.)
A. PE routers maintain customer routes in the VPN for that customer.
B. They use the explicit-null label by default.
C. P routers are used only for label transit.
D. P routers maintain customer routes in the VPN for that customer.
E. They support only one route target.
F. Each interface on a PE router must have its own VRF.
Answer: A,C
Q334. What is the function of the command ip pim autorp listener?
A. It allows a border PIM sparse mode router to accept autorp information from another autonomous system.
B. It allows the mapping agents to accept autorp information from the PIM rendezvous point.
C. It allows the routers to flood the autorp information in a sparse-mode-only network.
D. It allows a BSR to accept autorp information and translate it into BSR messages.
Answer: C
Explanation:
To cause IP multicast traffic for the two Auto-RP groups 224.0.1.39 and 224.0.1.40 to be Protocol Independent Multicast (PIM) dense mode flooded across interfaces operating in PIM sparse mode, use the ip pim autorp listener command in global configuration mode. To disable this feature, use the no form of this command.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/command/imc-cr-book/imc_i3.html#wp3085748429
Q335. Refer to the exhibit.
Notice that debug ip bgp updates have been enabled. What can you conclude from the debug output?
A. This is the result of the clear ip bgp 10.1.3.4 in command.
B. This is the result of the clear ip bgp 10.1.3.4 out command.
C. BGP neighbor 10.1.3.4 performed a graceful restart.
D. BGP neighbor 10.1.3.4 established a new BGP session.
Answer: A
Explanation:
If you enter the clear ip bgp out command for a BGP peer, that router resends its BGP prefixes to that peer. This does not cause a change in the best path on the receiving BGP peer. Hence, there is no change in the Table Version on that peer.
When you run the debug ip bgp updates on the receiving router, you see:
BGP(0): 10.1.3.4 rcvd UPDATE w/ attr: nexthop 10.1.3.4, origin i, metric 0, merged path 4, AS_PATH
BGP(0): 10.1.3.4 rcvd 10.100.1.1/32...duplicate ignored
The received update is recognized as a duplicate, so it is ignored and no best path change occurs.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116511-technote-tableversion-00.html
Up to the minute 400-101 ccie dumps free download:
Q336. DRAG DROP
Drag and drop the multiprotocol BGP feature on the left to the corresponding description on the right.
Answer:
Q337. Refer to the exhibit.
Traffic from CE1 to CE2 is traveling through the core instead of through R1. All the PE routers have a similar configuration, and BGP peering and extended-community meshing are configured correctly.
Which configuration change routes the traffic through R1?
A)
B)
C)
D)
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
Answer: A
Q338. Which EIGRP configuration results in subsecond failover outside of the basic routing
protocol convergence?
A. bfd all-interfaces
B. timers active-time disabled
C. timers active-time 1
D. timers nsf route-hold 20
Answer: A
Q339. Which statement about NAT64 is true?
A. NAT64 provides address family translation and translates IPv4 to IPv6 and IPv6 to IPv4.
B. NAT64 provides address family translation and can translate only IPv6 to IPv4.
C. NAT64 should be considered as a permanent solution.
D. NAT64 requires the use of DNS64.
Answer: A
Q340. Which two statements about PBR route maps are true? (Choose two.)
A. They can use extended ACLs to identify traffic.
B. They can route unicast traffic without interface-level classification.
C. They can be applied to both ingress and egress traffic.
D. They can classify traffic based on prefix-lists.
E. They can set the metric and IP precedence bits.
Answer: A,B