Cisco 640-878 Exam Preparation Material

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Question No. 1

What are three common problems related to sessions not establishing between iBGP neighbors? (Choose three.)

Answer: B, D, E

Question No. 2

The permit 172.16.32.0 0.0.15.255 access-list entry permits exactly which IP address range?

Answer: A

Question No. 3

Refer to the partial configurations exhibit.

What additional configurations are required to enable inter-VLAN routing for VLANs 10 and 20 on the Cisco ME 3400 switch using the metro IP access image?

Answer: C

Question No. 4

Refer to the exhibit.

What additional configuration is required to enable inter-VLAN routing for VLANs 10 and 20 on the Cisco ME 3400 switch using the Metro IP Access image?

Answer: C

Question No. 5

Which three statements about service provider network requirements are true? (Choose three.)

Answer: B, D, E

Question No. 6

Which two statements about NAT64 are true? (Choose two.)

Answer: C, E

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/white_paper_c11-676278.html

All viable translation scenarios are supported by NAT64, and therefore NAT64 is becoming the most sought translation technology. AFT using NAT64 technology can be achieved by either stateless or stateful means:

* Stateless NAT64, defined in RFC 6145, is a translation mechanism for algorithmically mapping IPv6 addresses to IPv4 addresses, and IPv4 addresses to IPv6 addresses. Like NAT44, it does not maintain any bindings or session state while performing translation, and it supports both IPv6-initiated and IPv4-initiated communications.

* Stateful NAT64, defined in RFC 6146, is a stateful translation mechanism for translating IPv6 addresses to IPv4 addresses, and IPv4 addresses to IPv6 addresses. Like NAT44, it is called stateful because it creates or modifies bindings or session state while performing translation. It supports both IPv6-initiated and IPv4-initiated communications using static or manual mappings.

DNS64, an optional component defined in RFC 6147, when used in conjunction with NAT64, would trick the IPv6 hosts into thinking that the IPv4 destination as an IPv6 address, by synthesizing AAAA (quad A) resource records from A resource records.

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