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2021 Nov 400-101 cisco ccie written:
Q41. Which IPv6 tunneling type establishes a permanent link between IPv6 domains over IPv4?
A. IPv4-compatible tunneling
B. ISATAP tunneling
C. 6to4 tunneling
D. manual tunneling
Answer: D
Explanation:
A manually configured tunnel is equivalent to a permanent link between two IPv6 domains over an IPv4 backbone. The primary use is for stable connections that require regular secure communication between two edge routers or between an end system and an edge router, or for connection to remote IPv6 networks.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-tunnel.html
Q42. Which command sets the maximum segment size for a TCP packet initiated from a router?
A. ip mtu
B. ip tcp adjust-mss
C. ip tcp mss
D. ip tcp window-size
Answer: C
Q43. Refer to the exhibit.
Which command can you enter to resolve this error message on a peer router?
A. username <username> password <password>
B. ppp chap <hostname>
C. aaa authorization exec if-authenticated
D. aaa authorization network if-authenticated
Answer: A
Q44. What are the three modes of Unicast Reverse Path Forwarding?
A. strict mode, loose mode, and VRF mode
B. strict mode, loose mode, and broadcast mode
C. strict mode, broadcast mode, and VRF mode
D. broadcast mode, loose mode, and VRF mode
Answer: A
Q45. 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.
Up to the minute 400-101 cisco ccie written:
Q46. DRAG DROP
Drag and drop the DMVPN command on the left to the corresponding function on the right.
Answer:
Q47. Refer to the exhibit. The Main1 and Branch1 switches are connected directly over an MPLS pseudowire, and both run UDLD. After router B1 reloads because of a power failure, the pseudowire is restored. However, the Branch1 switch is unable to reach the Main1 switch.
Which two actions can you take to restore connectivity and prevent the problem from recurring? (Choose two.)
A. Configure a backup pseudowire between the Main1 and Branch1 switches.
B. Enable UDLD recovery on both the Main1 and Branch1 switches.
C. Configure a backup GRE tunnel between the Main1 and Branch1 switches.
D. Enable errdisable recovery on both the Main1 and Branch1 switches.
E. Issue the shutdown and no shutdown commands on both the Branch1 switch’s uplink to the B1 router and the Main1 switch’s uplink to the M1 router.
F. Issue the shutdown and no shutdown commands on the Branch1 switch uplink to the B1 router only.
Answer: D,F
Q48. Refer to the exhibit.
Which OSPFv3 routes will be visible in the routing table of R2?
A. 2001:12::1/128
B. 2001:12::1/128, 2001:112::1/128
C. 2001:12::2/128
D. No OSPFv3 routes will be visible.
Answer: D
Explanation:
The command “ipv6 unicast-routing” needs to be configured on both routers before any IPv6 routes will be seen.
Q49. Which two methods change the IP MTU value for an interface? (Choose two.)
A. Configure the default MTU.
B. Configure the IP system MTU.
C. Configure the interface MTU.
D. Configure the interface IP MTU.
Answer: C,D
Explanation:
An IOS device configured for IP+MPLS routing uses three different Maximum Transmission Unit (MTU) values: The hardware MTU configured with the mtu interface configuration command
. The IP MTU configured with the ip mtu interface configuration command
. The MPLS MTU configured with the mpls mtu interface configuration command
The hardware MTU specifies the maximum packet length the interface can support … or at least that's the theory behind it. In reality, longer packets can be sent (assuming the hardware interface chipset doesn't complain); therefore you can configure MPLS MTU to be larger than the interface MTU and still have a working network. Oversized packets might not be received correctly if the interface uses fixed-length buffers; platforms with scatter/gather architecture (also called particle buffers) usually survive incoming oversized packets.
IP MTU is used to determine whether am IP packet forwarded through an interface has to be fragmented. It has to be lower or equal to hardware MTU (and this limitation is enforced). If it equals the HW MTU, its value does not appear in the running configuration and it tracks the changes in HW MTU. For example, if you configure ip mtu 1300 on a Serial interface, it will appear in the running configuration as long as the hardware MTU is not equal to 1300 (and will not change as the HW MTU changes). However, as soon as the mtu 1300 is configured, the ip mtu 1300 command disappears from the configuration and the IP MTU yet again tracks the HW MTU.
Reference: http://blog.ipspace.net/2007/10/tale-of-three-mtus.html
Q50. Refer to the exhibit.
Which option is the most likely explanation of the duplicate address message logged?
A. HSRP misconfiguration
B. a PC with IP of 10.10.1.1
C. spanning-tree-loop
D. a hardware problem
Answer: A