Cisco 640-878 - Building Cisco Service Provider Next-Generation Networks, Part 2 Exam

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Total 126 questions

Which command configures a switchport to connect only a host device in VLAN 301?

  • A. switchport access vlan 301
  • B. switchport mode trunk vlan 301
  • C. switchport mode access vlan 301
  • D. switchport vlan 301


Answer : A

Which IPv6 address block is reserved for 6to4 tunneling?

  • A. 2000::/16
  • B. 2001::/16
  • C. 2002::/16
  • D. 3ffe::/16
  • E. fe80::/16


Answer : C

Explanation: Explanation/Reference:
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel.html#wp1055738

Prerequisites -
With 6to4 tunnels, the tunnel destination is determined by the border router IPv4 address, which is concatenated to the prefix 2002::/16 in the format 2002:border-router-IPv4- address::/48. The border router at each end of a 6to4 tunnel must support both the IPv4 and IPv6 protocol stacks.

Restrictions -
The configuration of only one IPv4-compatible tunnel and one 6to4 IPv6 tunnel is supported on a router. If you choose to configure both of those tunnel types on the same router, we strongly recommend that they do not share the same tunnel source.
The reason that a 6to4 tunnel and an IPv4-compatible tunnel cannot share an interface is that both of them are NBMA "point-to-multipoint" access links and only the tunnel source can be used to reorder the packets from a multiplexed packet stream into a single packet stream for an incoming interface. So when a packet with an IPv4 protocol type of 41 arrives on an interface, that packet is mapped to an IPv6 tunnel interface based on the IPv4 address. However, if both the 6to4 tunnel and the IPv4-compatible tunnel share the same source interface, the router is not able to determine the IPv6 tunnel interface to which it should assign the incoming packet.
IPv6 manually configured tunnels can share the same source interface because a manual tunnel is a "point-topoint" link, and both the IPv4 source and IPv4 destination of the tunnel are defined.

A customer has created a new VLAN for the subnet that was allocated to them. Computers on the subnets can ping their default gateway, but theycannotping devices in the other subnet. What is most likely the problem?

  • A. Firewall on the Provider Edge is blocking access
  • B. InterVLAN routing is not configured
  • C. BGP has not been configured with the Provider Edge router
  • D. VLAN Switched Virtual Interface is in a down state


Answer : B

Which of the following commands would be used to prevent a switchport from processing
Bridge Protocol Data Units?

  • A. switch(config)#bpdu filter enable
  • B. switch(config)#no bpdu enable
  • C. switch(config-if)#spanning-tree bpdufilter enable
  • D. switch(config-if)#no spanning-tree bpdu filter enable
  • E. switch(config-if)#spanning-tree bpdu guard


Answer : C

Which two commands are required to configure an access port for both voice VLAN 20 and data VLAN 30? (Choose two.)

  • A. switchport mode access 30
  • B. switchport data vlan 30
  • C. switchport access data 20
  • D. switchport access data 30
  • E. switchport access vlan 30
  • F. switchport mode voice 20
  • G. switchport voice vlan 20


Answer : E,G

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Total 126 questions