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Q341. Which two events occur when a packet is decapsulated in a GRE tunnel? (Choose two.)
A. The destination IPv4 address in the IPv4 payload is used to forward the packet.
B. The TTL of the payload packet is decremented.
C. The source IPv4 address in the IPv4 payload is used to forward the packet.
D. The TTL of the payload packet is incremented.
E. The version field in the GRE header is incremented.
F. The GRE keepalive mechanism is reset.
Answer: A,B
Explanation:
After the GRE encapsulated packet reaches the remote tunnel endpoint router, the GRE packet is decapsulated. The destination address lookup of the outer IP header (this is the same as the tunnel destination address) will find a local address (receive) entry on the ingress line card. The first step in GRE decapsulation is to qualify the tunnel endpoint, before admitting the GRE packet into the router, based on the combination of tunnel source (the same as source IP address of outer IP header) and tunnel destination (the same as destination IP address of outer IP header). If the received packet fails tunnel admittance qualification check, the packet is dropped by the decapsulation router. On successful tunnel admittance check, the decapsulation strips the outer IP and GRE header off the packet, then starts processing the inner payload packet as a regular packet. When a tunnel endpoint decapsulates a GRE packet, which has an IPv4/IPv6 packet as the payload, the destination address in the IPv4/IPv6 payload packet header is used to forward the packet, and the TTL of the payload packet is decremented.
Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/addr-serv/configuration/guide/b-ipaddr-cg53asr9k/b-ipaddr-cg53asr9k_chapter_01001.html
Q342. DRAG DROP
Drag and drop the RIP configuration command on the left to the function it performs on the right.
Answer:
Q343. Which two protocols are used to establish IPv6 connectivity over an MPLS network? (Choose two.)
A. 6PE
B. 6VPE
C. RSVP
D. ISATAP
E. LDP
F. IPv6IP
Answer: A,B
Q344. Refer to the exhibit.
Which statement is true?
A. R1 routes this pseudowire over MPLS TE tunnel 1 with transport label 20.
B. The default route 0.0.0.0/0 is available in the IPv4 routing table.
C. R1 is using an MPLS TE tunnel for this pseudowire, because the IP path is not available.
D. R1 has preferred-path configured for the pseudowire.
Answer: D
Explanation:
Verifying the Configuration: Example In the following example, the show mpls l2transport vc command shows the following information (in bold) about the VCs:
. VC 101 has been assigned a preferred path called Tunnel1. The default path is disabled because the preferred path specified that the default path should not be used if the preferred path fails.
. VC 150 has been assigned an IP address of a loopback address on PE2. The default path can be used if the preferred path fails.
Router# show mpls l2transport vc detail
Local interface. Gi0/0/0.1 up, line protocol up, Eth VLAN 222 up
Destination address: 10.16.16.16, VC ID. 101, VC status: up
Preferred path: Tunnel1, active
Default path: disabled
Tunnel label: 3, next hop point2point
Output interfacE. Tu1, imposed label stack {17 16}
Create timE. 00:27:31, last status change timE. 00:27:31
Signaling protocol: LDP, peer 10.16.16.16:0 up
MPLS VC labels: local 25, remote 16
Group ID. local 0, remote 6
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
VC statistics:
packet totals: receive 10, send 10
byte totals: receive 1260, send 1300
packet drops: receive 0, send 0
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srtunsel.html#wp10 57815
Q345. Which three characteristics are shared by subinterfaces and associated EVNs? (Choose three.)
A. IP address
B. routing table
C. forwarding table
D. access control lists
E. NetFlow configuration
Answer: A,B,C
Q346. In the DiffServ model, which class represents the lowest priority with the highest drop probability?
A. AF11
B. AF13
C. AF41
D. AF43
Answer: B
Explanation:
Assured Forwarding (AF) Behavior Group
Class 1
Class 2
Class 3
Class 4
Low Drop
AF11 (DSCP 10)
AF21 (DSCP 18)
AF31 (DSCP 26)
AF41 (DSCP 34)
Med Drop
AF12 (DSCP 12)
AF22 (DSCP 20)
AF32 (DSCP 28)
AF42 (DSCP 36)
High Drop
AF13 (DSCP 14)
AF23 (DSCP 22)
AF33 (DSCP 30)
AF43 (DSCP 38)
Reference: http://en.wikipedia.org/wiki/Differentiated_services
Q347. Which type of OSPF packet is an OSPF link state update packet?
A. type 1
B. type 2
C. type 3
D. type 4
E. type 5
Answer: D
Explanation:
Link State Update packets are OSPF packet type 4. These packets implement the flooding of link state advertisements. Each Link State Update packet carries a collection of link state advertisements one hop further from its origin. Several link state advertisements may be included in a single packet.
Reference: http://www.freesoft.org/CIE/RFC/1583/107.htm
Q348. What does a nonzero forwarding address indicate in a type-5 LSA?
A. It indicates that this link-state ID is eligible for ECMP.
B. It indicates that this router should have an OSPF neighbor relationship with the forwarding address before using this link-state ID.
C. It indicates that the receiving router must check that the next hop is reachable in its routing table before using this link-state ID.
D. It indicates that traffic can be directly routed to this next hop in shared segment scenarios where the external route source is directly connected.
Answer: D
Explanation:
The value of the forwarding address specified by the autonomous system boundary router (ASBR) can be either 0.0.0.0 or non-zero. The 0.0.0.0 address indicates that the originating router (the ASBR) is the next hop. The forwarding address is determined by these conditions:
. The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes.
. These conditions set the forwarding address field to a non-zero address: ASBR's next hop interface address falls under the network range specified in the router ospf command.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13682-10.html
Q349. Which statement is true about VPLS?
A. MPLS is not required for VPLS to work.
B. VPLS carries packets as Layer 3 multicast.
C. VPLS has been introduced to address some shortcomings of OTV.
D. VPLS requires an MPLS network.
Answer: D
Explanation:
VPLS uses MPLS labels so an MPLS network is required. VPLS MPLS packets have a two-label stack. The outer label is used for normal MPLS forwarding in the service provider's network. If BGP is used to establish the VPLS, the inner label is allocated by a PE as part of a label block. If LDP is used, the inner label is a virtual circuit ID assigned by LDP when it first established a mesh between the participating PEs. Every PE keeps track of assigned inner label, and associates these with the VPLS instance.
Reference: http://en.wikipedia.org/wiki/Virtual_Private_LAN_Service
Q350. Which two statements about the client-identifier in a DHCP pool are true? (Choose two.)
A. It specifies a unique identifier that is used only for DHCP requests.
B. It is specified by appending 01 to the MAC address of a DHCP client.
C. It specifies a hardware address for the client.
D. It specifies a unique identifier that is used only for BOOTP requests.
E. It requires that you specify the hardware protocol.
Answer: A,B
Reference:
client-identifier unique-identifier
Example:
Device(dhcp-config)# client-identifier 01b7.0813.8811.66
Specifies the unique identifier for DHCP clients.
This command is used for DHCP requests.
DHCP clients require client identifiers. You can specify the unique identifier for the client in either of the following ways:
A 7-byte dotted hexadecimal notation. For example, 01b7.0813.8811.66, where 01 represents the Ethernet media type and the remaining bytes represent the MAC address of the DHCP client.
A 27-byte dotted hexadecimal notation. For example, 7665.6e64.6f72.2d30.3032.342e.3937.6230.2e33.3734.312d.4661.302f.31. The equivalent ASCII string for this hexadecimal value is vendor-0024.97b0.3741-fa0/1, where vendor represents the vendor, 0024.97b0.3741 represents the MAC address of the source interface, and fa0/1 represents the source interface of the DHCP client.
See the Troubleshooting Tips section for information about how to determine the client identifier of the DHCP client.
Note
The identifier specified here is considered for a DHCP client that sends a client identifier in the packet.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-mt/dhcp-15-mt-book/config-dhcp-server.html
