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Q481. For which two conditions is Cisco Express Forwarding recursion disabled by default when the BGP Prefix Independent Convergence functionality is enabled? (Choose two.)
A. next hops learned with a /24 mask
B. next hops learned with any mask shorter than /32
C. next hops learned with a /32 mask
D. next hops that are directly connected
Answer: C,D
Explanation:
Recursion is the ability to find the next longest matching path when the primary path goes down. When the BGP PIC feature is not installed, and if the next hop to a prefix fails, Cisco Express Forwarding finds the next path to reach the prefix by recursing through the FIB to find the next longest matching path to the prefix. This is useful if the next hop is multiple
hops away and there is more than one way of reaching the next hop.
However, with the BGP PIC feature, you may want to disable Cisco Express Forwarding recursion for the following reasons:
. Recursion slows down convergence when Cisco Express Forwarding searches all the FIB entries.
. BGP PIC Edge already precomputes an alternate path, thus eliminating the need for Cisco Express Forwarding recursion.
When the BGP PIC functionality is enabled, Cisco Express Forwarding recursion is disabled by default for two conditions:
. For next hops learned with a /32 network mask (host routes)
. For next hops that are directly connected
For all other cases, Cisco Express Forwarding recursion is enabled.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-bgp-mp-pic.html
Q482. Refer to the exhibit.
R3 is failing to join the multicast group 224.1.1.1 that is sourcing from R1. Which two actions can you take to allow multicast traffic to flow correctly? (Choose two.)
A. Remove the static multicast route on R1.
B. Configure OSPF on R1 and R3 to include the tunnel interfaces.
C. Add an additional static multicast route on R2 for multicast group 224.1.1.1 toward R3.
D. Replace the static multicast route on R1 to send traffic toward R2.
E. Remove the static unicast route on R1.
F. Add an additional static unicast route on R2 toward the loopback interface of R3.
Answer: A,B
Explanation:
Since the tunnel interfaces are not part of OSPF, the best path to the multicast source of R1 from R3 would be over the Gi0/0 path via OSPF. However, the static mroute is configured to use the tunnel, so this causes an RPF failure used in Sparse Mode. Best fix is to add the tunnel interfaces into OSPF and remove the static mroute so that that the RPF check no longer fails.
Q483. Which two statements are true about RSTP? (Choose two.)
A. By default, RTSP uses a separate TCN BPDU when interoperating with 802.1D switches.
B. By default, RTSP does not use a separate TCN BPDU when interoperating with 802.1D switches.
C. If a designated port receives an inferior BPDU, it immediately triggers a reconfiguration.
D. By default, RTSP uses the topology change TC flag.
E. If a port receives a superior BPDU, it immediately replies with its own information, and no reconfiguration is triggered.
Answer: B,D
Explanation:
The RSTP does not have a separate topology change notification (TCN) BPDU. It uses the topology change (TC) flag to show the topology changes.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_9_ea1/configuration/guide/scg/swmstp.html
Q484. Which two types of traffic are blocked when the storm control threshold for multicast traffic is reached on a port? (Choose two.)
A. BPDU
B. OSPF
C. CDP
D. IS-IS
E. LLDP
Answer: B,D
Q485. Which two statements about device access control are true? (Choose two.)
A. The AUX port is displayed as type tty in the output of the show line command.
B. VTY lines are associated with physical interfaces on a network device.
C. MPP restricts device-management access to interfaces that are configured under the control plane host configuration.
D. The enable password command sets an MD5 one-way encrypted password.
E. The console port supports hardware flow control
Answer: C,E
Q486. Which three options are sub-subfields of the IPv4 Option Type subfield? (Choose three.)
A. Option Class
B. GET
C. Copied
D. PUSH
E. Option Number
F. TTL
Answer: A,C,E
Explanation:
Each IP option has its own subfield format, generally structured as shown below. For most options, all three subfields are used. Option Type, Option Length and Option Data.
Reference: http://www.tcpipguide.com/free/t_IPDatagramOptionsandOptionFormat.htm
Q487. Refer to the exhibit.
How many EIGRP routes will appear in the routing table of R2?
A. 0
B. 1
C. 2
D. 3
Answer: A
Explanation:
EIGRPv6 on R2 was shut down so there is no EIGRP routes on the routing table of R2. If we turn on EIGRPv6 on R2 (with “no shutdown” command) then we would see the prefix of the loopback interface of R1 in the routing table of R2.
Note. EIGRPv6 requires the “ipv6 unicast-routing” global command to be turned on first or it will not work.
Q488. 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
Q489. Refer to the exhibit.
Which two statements about how the configuration processes Telnet traffic are true? (Choose two.)
A. Telnet traffic from 10.1.1.9 to 10.10.10.1 is dropped.
B. All Telnet traffic is dropped.
C. Telnet traffic from 10.10.10.1 to 10.1.1.9 is permitted.
D. Telnet traffic from 10.1.1.9 to 10.10.10.1 is permitted.
E. Telnet traffic is permitted to all IP addresses.
Answer: A,C
Explanation:
The ACL applied to the COPP policy matches only telnet traffic from 10.1.1.9 to 10.10.10.1, all other telnet traffic is not matched and therefore not used in the COPP policy, which means this traffic will be handled normally (accepted). For telnet traffic from 10.1.1.9 to 10.10.10.1, the COPP policy has defined this traffic as an exceed, and dropped.
Q490. Refer to the exhibit.
What is the role of this multicast router?
A. a first-hop PIM router
B. a last-hop PIM router
C. a PIM rendezvous point
D. a PIM inter-AS router
Answer: C
Explanation:
The following is sample output from the show ip pim tunnel taken from an RP. The output is used to verify the PIM Encap and Decap Tunnel on the RP:
Switch# show ip pim tunnel
Tunnel0
Type : PIM Encap
RP : 70.70.70.1*
SourcE. 70.70.70.1
Tunnel1*
Type : PIM Decap
RP : 70.70.70.1*
SourcE. -R2#
The asterisk (*) indicates that the router is the RP. The RP will always have a PIM Encap and Decap Tunnel interface.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/multic ast/command_reference/b_mc_3se_3650_cr/b_mc_3se_3650_cr_chapter_010.html#wp12 86920037