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Q1. Refer to the exhibit. The referenced TE tunnels compete for bandwidth requirements over the limited available bandwidth that is provisioned. Which core MPLS component erases a conflict and provides admission control for any new added TE tunnel?
A. link management
B. link attributes
C. MPLS TE priorities
D. RSVP
Answer: D
Explanation: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/mpls/configuration/guide/mpls_cg/mp_te_RSVP.pdf
Q2. An IS-IS enabled router with multiple IS-IS neighbors is required to have BFD sessions with all neighbors. Which BFD mode should you use when you want to save the overhead of periodic protocol control packets?
A. echo
B. asynchronous
C. demand
D. active
Answer: C
Explanation: https://tools.ietf.org/html/rfc5880#section-3.1 RFC - 5880
Q3. In a secure domain router scenario, which two functions are shared amongst all SDR in the system? (Choose two.)
A. configuration
B. protocols
C. routing tables
D. chassis-control
E. switch-fabric
Answer: D,E
Explanation:
Secure domain routers (SDRs) provide a means of partitioning a router into multiple, independent routers. SDRs perform routing functions in the same manner as a physical router but share resources with the rest of the system. For example, the applications, configurations, protocols, and routing tables assigned to an SDR belong to that SDR only, but other functions such as chassis control, switch fabric, and partitioning are shared with the rest of the system.
Reference: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-3/system_management/command/reference/b_sysman_cr43crs/b_sysman_cr43crs_chapt er_01110.html
Q4. Refer to the exhibit.
What is the status of the L2 tunnel between PE1. PE2. and the Layer 2 switches?
A. The Layer 2 tunnel is up, and SW1 becomes the root bridge for VLAN 10.
B. The Layer 2 tunnel is down, due to the ACL that is applied on the PE2 interface.
C. The Layer 2 tunnel is up, but no BPDUs are exchanged unless an extra configuration is applied.
D. The Layer 2 tunnel is down, due to the MTU mismatch between SW1 and SW2.
Answer: A
Q5. Refer to the exhibit. Why is R3 unable to install 1.1.1.1/32 in its routing table?
A. 11.11.11.11/32 exists in the routing table, so the conditional advertising is not working.
B. The route is filtered out by the ip prefix-list ROUTE-IN command.
C. 11.11.11.11/32 is advertising in the BGP table, so conditional advertising is not working.
D. The bgp redistribute-internal command is missing under the R2 BGP process.
Answer: B
Q6. In which way does the DS-Lite IPv6 transitioning mechanism differ from IPv6 Dual-Stack?
A. DS-Lite is a combination of tunnel and translation technologies.
B. DS-Lite is a transition technology that gives full IPv6 connectivity for IPv6 capable hosts that are on the IPv4 Internet but have no native connection to an IPv6 network.
C. DS-Lite is an automatic tunnel where the tunnel destination is determined by the IPv4 address extracted from the IPv6 address that starts with the prefix 2002::/16.
D. DS-Lite is a stateless tunneling mechanism with a lightweight and secure manner without requiring upgrades to existing IPv4 access network infrastructure.
Answer: A
Explanation: http://www.cisco.com/c/en/us/products/collateral/service-provider/carrier-grade-ipv6-solution/white_paper_c11-558744-00.html
Q7. Which QoS DiffServ mode preserves the original customer IP marking besides of on egress PE router uses the DSCP value of this IP packet on outbound queuing?
A. MPLS PHB mode
B. Pipe mode
C. IntServ mode
D. Uniform mode
E. Short-Pipe mode
Answer: E
Q8. Refer to the exhibit.
When a traceroute is performed from a PC behind R2, the next hop on R1 for IPv4 is 10.0.1.2, and for IPv6 it is 2001:DB8:2:2. What is causing thus behavior?
A. GigabitEthernet2/1 has a Level 1-only adjacency. This causes it to be the preferred path for the IPv6 packets.
B. When SPF ran on R2, it calculated two equal paths to R1. It was a coincidence that than the packets choose different paths.
C. Multitopology is enabled on R2, which causes the IPv6 packets to use a different path than the IPv4 packets.
D. 2001:DB8:2::2 is on a Gigabit Ethernet interface. Because its speed is higher than Fast Ethernet, the IS-IS metric is preferred.
Answer: C
Q9. A network engineer is responsible for implementing a solution with Cisco IOS XR Software that insures continuous forwarding during a control plane failure. Which two technologies should the engineer consider? (Choose two.)
A. TE FRR
B. IP FRR
C. graceful restart
D. BFD
E. NSR
Answer: C,E
Explanation: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-3/mpls/configuration/guide/b_mpls_cg43xcrs/b_mpls_cg43crs_chapter_01.html#task_1129
Q10. Refer to the exhibit. R1 and R2 are multicast routers running PIM over Serial1/0. The PIM adjacency on R1 is not forming with the given configuration. What command can be entered on R1 to resolve the issue?
A. no access-list 100 deny 103 any any
B. no access-list 100 deny udp any anyeq 103
C. no access-list 100 deny ip any host 224.0.0.1
D. no access-list 100 deny ip any host 224.0.0.2
Answer: A
Explanation:
All PIM protocols share a common control message format. PIM control messages are sent as raw IP datagrams (protocol number 103), either multicast to the link-local ALL PIM
ROUTERS multicast group, or unicast to a specific destination.
Reference: http://www.metaswitch.com/resources/what-is-protocol-independent-multicast-pim