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最新的 JNCIP-SP JN0-664 免費考試真題 (Q73-Q78):

問題 #73
Which two statements are correct about the customer interface in an LDP-signaled pseudowire?
(Choose two.)

A. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement.
B. When the encapsulation is ethernet-ccc, tagged and untagged frames are both accepted in the data plane.
C. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement.
D. When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane.

答案：B,C

問題 #74
Exhibit

CE-1 and CE-2 are part of a VPLS called Customer1 No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.

A. The route distinguisher must match on PE-1 and PE-2.
B. The route target must match on PE-1 and PE-2.
C. The instance type should be changed to I2vpn.
D. The no-tunnel-services statement should be deleted on both PEs.

答案：B

解題說明：
VPLS is a technology that provides Layer 2 VPN services over an MPLS network. VPLS uses BGP as its control protocol to exchange VPN membership information between PE routers. The route target is a BGP extended community attribute that identifies which VPN a route belongs to. The route target must match on PE routers that participate in the same VPLS instance, otherwise they will not accept or advertise routes for that VPLS.

問題 #75
Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)

A. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.
B. Bootstrap messages are forwarded only to routers that explicitly requested the messages within the PIM sparse-mode domain
C. Bootstrap messages distribute RP information dynamically during an RP election.
D. Bootstrap messages are used to notify which router is the PIM RP

答案：A,C

解題說明：
Bootstrap messages are PIM messages that are used to distribute rendezvous point (RP) information dynamically during an RP election. Bootstrap messages are sent by bootstrap routers (BSRs), which are routers that are elected to perform the RP discovery function for a PIM sparse-mode domain. Bootstrap messages contain information about candidate RPs and their multicast groups, as well as BSR priority and hash mask length. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain using hop-by-hop flooding.

問題 #76
When using OSPFv3 for an IPv4 environment, which statement is correct?

A. OSPFv3 only supports IPv4.
B. OSPFv3 supports both IPv6 and IPv4, but not in the same routing instance.
C. OSPFv3 is not backward compatible with IPv4
D. OSPFv3 supports IPv4 only on interfaces with family inet6 defined

答案：C

解題說明：
Explanation
OSPFv3 is an extension of OSPFv2 that supports IPv6 routing and addressing. OSPFv3 is not backward compatible with IPv4 because it uses a different packet format and a different link-state advertisement (LSA) structure than OSPFv2. OSPFv3 also uses IPv6 link-local addresses as router IDs and neighbor addresses, instead of IPv4 addresses. To use OSPFv3 for an IPv4 environment, you need to enable the IPv4 unicast address family under [edit protocols ospf3] hierarchy level and configure IPv4 addresses on the interfaces.

問題 #77
Which two statements about IS-IS are correct? (Choose two.)

A. PSNPs are flooded periodically.
B. PSNPs contain only descriptions of LSPs.
C. CSNPs contain only descriptions of LSPs.
D. CSNPs are flooded periodically.

答案：B,D

解題說明：
LSPs contain information about the state and cost of links in the network, and are flooded periodically throughout the network. PSNPs are used to acknowledge receipt of LSPs and request retransmission of missing or corrupted LSPs. PSNPs contain only descriptions of LSPs, such as their sequence numbers and checksums. CSNPs contain a complete list of all link-state PDUs in the IS-IS database. CSNPs are sent periodically on all links, and the receiving systems use the information in the CSNP to update and synchronize their link-state PDU databases.

問題 #78
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