[Free] 2018(Mar) EnsurePass Braindumps Cisco 640-878 Dumps with VCE and PDF 1-10

Ensurepass.com : Ensure you pass the IT Exams
2018 Mar Cisco Official New Released 640-878
100% Free Download! 100% Pass Guaranteed!

Building Cisco Service Provider Next-Generation Networks, Part 2

Question No: 1

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

  1. switchport access vlan 301

  2. switchport mode trunk vlan 301

  3. switchport mode access vlan 301

  4. switchport vlan 301

Answer: A

Question No: 2

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


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.


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 quot;point-to-multipointquot; 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 quot;point-topointquot; link, and both the IPv4 source and IPv4 destination of the tunnel are defined.

Question No: 3

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?

  1. Firewall on the Provider Edge is blocking access

  2. InterVLAN routing is not configured

  3. BGP has not been configured with the Provider Edge router

  4. VLAN Switched Virtual Interface is in a down state

Answer: B

Question No: 4

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

  1. switch(config)#bpdu filter enable

  2. switch(config)#no bpdu enable

  3. switch(config-if)#spanning-tree bpdufilter enable

  4. switch(config-if)#no spanning-tree bpdu filter enable

  5. switch(config-if)#spanning-tree bpdu guard

Answer: C

Question No: 5

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

  1. switchport mode access 30

  2. switchport data vlan 30

  3. switchport access data 20

  4. switchport access data 30

  5. switchport access vlan 30

  6. switchport mode voice 20

  7. switchport voice vlan 20

Answer: E,G

Question No: 6

Within an MPLS domain, which table is used by the ingress edge LSR to make forwarding decisions when an unlabeled IP packet is received?

  1. FIB

  2. LFIB

  3. LIB

  4. MP-BGP

  5. VRF

Answer: A

Explanation: Explanation/Reference:

Question No: 7

On Cisco IOS XR software, which set of commands enables OSPF area 0 on the Gi0/0/0/0 interface that has an IPv4 IP address of

  1. router ospf 1

    network area 0

  2. router ospf 1

    network area 0

  3. router ospf 1 area 0

    interface gi0/0/0/0

  4. router ospfv3 1

    network area 0

  5. router ospfv3 1

    network area 0

  6. router ospfv3 1 area 0


  7. router ospfv3 1 area 0

interface gi0/0/0/0

Answer: C

Question No: 8

Refer to the exhibit.

The access list has been configured on the Gi0/0/0/0 interface in the inbound direction. Which two packets that are sourced from TCP port 1050, if they are routed to the Gi0/0/0/0 interface, will be permitted? (Choose two)

  1. destination IP address:, destination TCP port: 80

  2. destination IP address:, destination TCP port: 80

  3. destination IP address:, destination TCP port: 80

  4. destination IP address:, destination TCP port: 23

  5. destination IP address:, destination TCP port: 23

  6. destination IP address:, destination TCP port: 23

Answer: A,B

Question No: 9

You have just enabled IS-IS on the lab testing network. You notice that IS-IS is not using the optimal path selection based on the interface bandwidth. Currently, the IS-IS routing

process seems to be selecting the best path based on the hop count.

What configuration change can you make to cause IS-IS to select the optimal path based on the interface bandwidth?

  1. Enable a wide-style IS-IS metric.

  2. Enable a narrow-style IS-IS metric.

  3. Change the default auto-cost reference bandwidth to a higher value.

  4. Change the default IS-IS metric on each of the router interfaces to better correspond to the interface bandwidth.

  5. Change the interface bandwidth by using the bandwidth interface configuration mode command.

Answer: D

Explanation: Explanation/Reference: http://bradhedlund.com/notes/is-is/

Question No: 10

What platform is best placed as the edge device within the Cisco Service Provider Next Generation Network architecture running IOS-XE?

  1. ASR 9000

  2. Catalyst 6509

  3. 2921 Router

  4. C3560G

  5. Catalyst 7609

Answer: A

100% Ensurepass Free Download!
Download Free Demo:640-878 Demo PDF
100% Ensurepass Free Guaranteed!
640-878 Dumps

EnsurePass ExamCollection Testking
Lowest Price Guarantee Yes No No
Up-to-Dated Yes No No
Real Questions Yes No No
Explanation Yes No No
Free VCE Simulator Yes No No
Instant Download Yes No No

You must be logged in to post a comment.

Proudly powered by WordPress   Premium Style Theme by www.gopiplus.com