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Q1. Which statement is true about trunking?
A. Cisco switches that run PVST+ do not transmit BPDUs on nonnative VLANs when using a dot1q trunk.
B. When removing VLAN 1 from a trunk, management traffic such as CDP is no longer passed in that VLAN.
C. DTP only supports autonegotiation on 802.1q and does not support autonegotiation for ISL.
D. DTP is a point-to-point protocol.
Answer: D
Explanation:
Ethernet trunk interfaces support different trunking modes. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface. To autonegotiate trunking, the interfaces must be in the same VTP domain. Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Point-to-Point Protocol. However, some internetworking devices might forward DTP frames improperly, which could cause misconfigurations.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swvlan.html
Q2. Which statement is true about MLD?
A. MLD v1 gives hosts the ability to receive multicast packets from specific source addresses.
B. All MLD messages are sent with a link-local IPv6 source address of FF02::D.
C. The multicast address field is cleared to zero when sending an MLD report message.
D. MLD is used by IPv6 routers to discover multicast listeners on a directly attached link.
Answer: D
Explanation:
IPv6 Multicast Listener Discovery (MLD) is used by IPv6 devices to discover multicast listeners (nodes that want to receive multicast packets destined for specific multicast addresses) on directly attached links. There are two versions of MLD. MLD version 1 is based on version 2 of the IGMP for IPv4, and MLD version 2 is based on version 3 of the IGMP for IPv4. IPv6 multicast for Cisco software uses both MLD version 2 and MLD version 1.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_lsm/configuration/xe-3s/imc-lsm-xe-3s-book/ipv6-mcast-mld-xe.html
Q3. Refer to the exhibit.
Which two actions can you take to enable CE-1 at site A to access the Internet? (Choose two.)
A. Create a default route for site A on PE-1 with the next hop set to the PE-2 interface to the Internet.
B. Originate a default route in site B with the next hop set to the PE-2 Internet interface, and import the default route into site A.
C. Create a default route on CE-1 with the next hop set to the PE-1 upstream interface.
D. Originate a default route in site A with the next hop set to the PE-2 interface to CE-1.
E. Create a static default route on CE-1 with the next hop set to the PE-2 interface to the Internet.
Answer: A,B
Q4. Which implementation can cause packet loss when the network includes asymmetric routing paths?
A. the use of ECMP routing
B. the use of penultimate hop popping
C. the use of Unicast RPF
D. disabling Cisco Express Forwarding
Answer: C
Explanation:
When administrators use Unicast RPF in strict mode, the packet must be received on the interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network.
Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html
Q5. Which protocol uses a proprietary 2-byte Type field for multiple protocol support?
A. HDLC
B. PPP
C. CHAP
D. PAP
Answer: A
Q6. Refer to the exhibit.
For which reason could a BGP-speaking device in autonomous system 65534 be prevented from installing the given route in its BGP table?
A. The AS number of the BGP is specified in the given AS_PATH.
B. The origin of the given route is unknown.
C. BGP is designed only for publicly routed addresses.
D. The AS_PATH for the specified prefix exceeds the maximum number of ASs allowed.
E. BGP does not allow the AS number 65535.
Answer: A
Explanation:
BGP is considered to be a 'Path Vector' routing protocol rather than a distance vector routing protocol since it utilises a list of AS numbers to describe the path that a packet should take. This list is called the AS_PATH. Loops are prevented because if a BGP speaking router sees it's own AS in the AS_PATH of a route it rejects the route.
Q7. Which two statements about the default behavior of IS-IS are true? (Choose two.)
A. The default IS-IS router type is L1/L2.
B. The default IS-IS metric type is wide.
C. The default IS-IS interface circuit type is L1/L2.
D. By default, two IS-IS routers must use the same hello interval and hold timer in order to become neighbors.
Answer: A,C
Q8. Refer to the exhibit.
Which statement about this GET VPN configuration is true?
A. Router 1 acts as the primary key server because it has a higher priority.
B. An RSA key has been imported into the configuration.
C. The GDOI group configuration generated a key.
D. DPD is disabled.
Answer: A
Q9. What is the preferred method to improve neighbor loss detection in EIGRP?
A. EIGRP natively detects neighbor down immediately, and no additional feature or configuration is required.
B. BFD should be used on interfaces that support it for rapid neighbor loss detection.
C. Fast hellos (subsecond) are preferred for EIGRP, so that it learns rapidly through its own mechanisms.
D. Fast hellos (one-second hellos) are preferred for EIGRP, so that it learns rapidly through its own mechanisms.
Answer: B
Explanation:
Bi-directional Forwarding Detection (BFD) provides rapid failure detection times between forwarding engines, while maintaining low overhead. It also provides a single, standardized method of link/device/protocol failure detection at any protocol layer and over any media.
Reference: “Bidirectional Forwarding Detection for EIGRP”
http://www.cisco.com/en/US/technologies/tk648/tk365/tk207/technologies_white_paper090 0aecd80243fe7.html
Q10. 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
Q11. Which two statements about UDP and latency are true? (Choose two.)
A. UDP is connection oriented, so the size of a UDP stream is independent of latency.
B. UDP is connection oriented, so latency can increase the size of a UDP stream.
C. UDP is connectionless, so latency can increase the size of a UDP stream.
D. If latency decreases, throughput also decreases.
E. If latency increases, throughput also increases.
F. Latency can cause jitter on UDP connections.
Answer: C,F
Q12. What is the purpose of EIGRP summary leaking?
A. to allow a summary to be advertised conditionally on specific criteria
B. to allow a component of a summary to be advertised in addition to the summary
C. to allow overlapping summaries to exist on a single interface
D. to modify the metric of the summary based on which components of the summary are operational
Answer: B
Explanation:
When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here.
http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685.
Q13. Refer to the exhibit.
A PE router is configured with a policy map that contains the policer shown. The policy map is configured in the inbound direction of an interface facing a CE router. If the PE router
receives 12Mb/s of traffic with the CoS value set to 7 on a 100-Mb/s interface from the CE router, what value of MPLS EXP is set when this traffic goes through the policer shown?
A. 0
B. 6
C. 7
D. 8
Answer: B
Explanation:
Here, the policer is set where the conforming traffic is set to 10 percent of the 100 Mbps interface, so anything more than 10 Mbps will be placed into the exceeding traffic class, the traffic EXP value will be changed from 7 to 6 per the configuration.
Q14. DRAG DROP
Drag each MPLS term on the left to the matching statement on the right.
Answer:
Q15. Refer to the exhibit.
Which statement about the configuration is true?
A. This configuration is incorrect because the dialer interface number must be the same as the dialer pool number.
B. This configuration is missing an IP address on the dialer interface.
C. This configuration is incorrect because the MTU must match the ppp-max-payload that is defined.
D. This configuration represents a complete PPPoE client configuration on an Ethernet connection.
Answer: D