[Free] 2018(May) EnsurePass Examcollection Cisco 640-878 Dumps with VCE and PDF 41-50

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Building Cisco Service Provider Next-Generation Networks, Part 2

Question No: 41

Which two statements about the link state routing process are true? (Choose two.)

  1. It uses the DUAL algorithm.

  2. It uses metrics such as AS path.

  3. All routers in the area have link state databases.

  4. The administrative distance is 1 by default.

  5. Each router in the area floods LSPs to all neighbors.

Answer: C,E

Question No: 42

What does the command #39;rep admin vlan 100#39; accomplish?

  1. confines flooding of REP messages to VLAN 100

  2. reserves REP admin VLAN to 100 so that no REP messages are sent on VLAN 100

  3. forces VLAN 100 into a REP block state

  4. this is an invalid command

Answer: A

Question No: 43

Which procedure is used as the last resort disaster recovery procedure to completely replace the currently installed IOS XR software on Cisco IOS XR routers?

  1. netboot

  2. turboboot

  3. install recovery

  4. install rollback

  5. install add and install activate

Answer: B

Explanation: Explanation/Reference: http://www.cisco.com/en/US/docs/routers/crs/software/crs_r4.0/migration/guide/tbupgapp.p df

Question No: 44

What do both Carrier Grade NAT and NAT64 have in common?

  1. both are only used in carrier networks

  2. both are used for tunneling IPv6 in an IPv4 network

  3. both require the use IPv6

  4. both are methods for avoiding IPv4 address exhaustion

Answer: D

Question No: 45

Which Cisco IOS-XR command is used to unpack a package on the local router?

  1. install boot

  2. install commit

  3. install add

  4. install package

Answer: C

Question No: 46

Refer to the configuration snippet below. A network engineer has been tasked with implementing a security policy that prevents subnet from accessing web server All users are now unable to access the web server. What

command is missing from the access list configuration?


switch(config)#access-list 1 deny switch(config)#interface FastEthernet 0/0

switch(config-if)# ip access-group 1 in

  1. switch(config-if)#ip access-group 1 out

  2. switch(config)#ip access-list 2 permit any any

  3. switch#ip access-list 2 permit any any

  4. switch(config)#ip access-list 1 permit any any

Answer: D

Question No: 47

When configuring an ACL entry, which network and wildcard mask matches only IP addresses to







Answer: B

Question No: 48

Which three are common ISP access network technologies? (Choose three.)

  1. DSL

  2. Cable modem

  3. DWDM

  4. MPLS

  5. PON

  6. MP-BGP

Answer: A,B,E

Explanation: Explanation/Reference: http://blog.ioshints.info/2010/02/passive-optical-networks.html- PON

Question No: 49

What type of package is bootable on the Cisco ASR 1000 router running IOS-XE?

  1. boot package

  2. consolidated package

  3. sub-package

  4. supplemental package

Answer: B

Question No: 50

Refer to the exhibit.

The access list has been configured on the Gi0/0/0/0 interface in the inbound direction. Which four packets that are sourced from TCP port 1060, if they are routed to the Gi0/0/0/0 interface, will be permitted? (Choose four)

  1. destination IP address:, destination TCP port: 8080

  2. destination IP address:, destination TCP port: 8080

  3. destination IP address:, destination TCP port: 8080

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

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

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

Answer: C,D,E,F

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