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

NEW QUESTION 1
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: EG

NEW QUESTION 2
What are three common problems related to sessions not establishing between iBGP neighbors? (Choose three.)

• A. Incorrect MAC-address configured
• B. Unable to reach IP
• C. Network is not configured under router bgp x configuration
• D. Access list
• E. Firewall blocking all TCP traffic
• F. Redistribution is not configured under router bgp x configuration

Answer: BDE

NEW QUESTION 3
What does the command 'rep admin vlan 100' accomplish?

• A. confines flooding of REP messages to VLAN 100
• B. reserves REP admin VLAN to 100 so that no REP messages are sent on VLAN 100
• C. forces VLAN 100 into a REP block state
• D. this is an invalid command

Answer: A

NEW QUESTION 4
A customer has installed a second router and copied the configuration from the first router, as shown below. What change is needed to ensure that router 1 is the primary IP address?
Router 1
standby 1 priority 110
standby 1 preempt
Router 2
standby 1 priority 120
standby 1 preempt

• A. decrease the priority on router 2 to 109
• B. decrease the priority on router 1 to 109
• C. remove standby 1 preempt from router 1
• D. increase the priority on router 2 to 130
• E. increase the priority on router 1 to 119

Answer: A

NEW QUESTION 5
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?

• A. interface Fa0/1ip address 192.168.10.1 255.255.255.0!interface Fa0/2ip address 192.168.20.1 255.255.255.0!
• B. interface Fa0/1ip address 192.168.10.1 255.255.255.0!interface Fa0/2ip address 192.168.20.1 255.255.255.0!router eigrp 1network 192.168.10.0network 192.168.20.0!
• C. interface vlan 10ip address 192.168.10.1 255.255.255.0!interface vlan 20ip address 192.168.20.1 255.255.255.0!
• D. interface Fa0/1 encapsulation dot1q 10ip address 192.168.10.1 255.255.255.0!interface Fa0/2 encapsulation dot1q 20ip address 192.168.20.1 255.255.255.0!

Answer: C

NEW QUESTION 6
Which commands will configure the spanning tree operating mode that can group multiple VLANs in a single domain?

• A. switch(config)#spanning-tree mode pvst
• B. switch(config)#spanning-tree mode rstp
• C. switch(config)#spanning-tree mode rapid-pvst
• D. switch(config)#spanning-tree mode mst
• E. switch(config)#spanning-tree mode mst-plus

Answer: D

NEW QUESTION 7
Which three are common ISP access network technologies? (Choose three.)

• A. DSL
• B. Cable modem
• C. DWDM
• D. MPLS
• E. PON
• F. MP-BGP

Answer: ABE

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

NEW QUESTION 8
Which IP addresses are matched by the permit 192.168.80.64 0.0.0.15 access-list entry?

• A. 192.168.80.64 to 192.168.80.255
• B. 192.168.80.64 to 192.168.80.96
• C. 192.168.80.64 to 192.168.80.95
• D. 192.168.80.64 to 192.168.80.80
• E. 192.168.80.64 to 192.168.80.79

Answer: E

NEW QUESTION 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?

• A. Enable a wide-style IS-IS metric.
• B. Enable a narrow-style IS-IS metric.
• C. Change the default auto-cost reference bandwidth to a higher value.
• D. Change the default IS-IS metric on each of the router interfaces to better correspond to the interface bandwidth.
• E. Change the interface bandwidth by using the bandwidth interface configuration mode command.

Answer: D

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

NEW QUESTION 10
Which statement about the benefits of MPLS PHP is true?

• A. PHP is implemented to increase the performance on the egress edge LS
• B. PHP allows the egress edge LSR to perform only one lookup to route the IP packet based on destination IP address and routing table.
• C. PHP is implemented to increase the performance on the egress edge LS
• D. PHP enables the egress edge LSR to perform only one lookup based on the ingress label.
• E. PHP is implemented to increase the performance on the egress edge LS
• F. PHP enables the egress edge LSR to perform two lookups, first lookup based on the ingress label and a second route lookup based on the destination IP address.
• G. PHP is implemented to increase the performance on the LSR (P routers). PHP enables the LSR (P routers) to perform only one lookup based on the ingress label.
• H. PHP is implemented to increase the performance on the LSR (P routers). PHP enables the LSR (P routers) to perform only one route lookup based on the destination IP address.
• I. PHP is implemented to increase the performance on the LSR (P routers). PHP enables the LSR (P routers) to perform two lookups, first lookup based on the ingress label and a second route lookup based on the destination IP address.
• J. PHP is implemented to increase the performance on the ingress edge LS
• K. PHP enables the ingress edge LSR to perform only one lookup based on the ingress label.
• L. PHP is implemented to increase the performance on the ingress edge LS
• M. PHP enables the ingress edge LSR to perform two lookups, first lookup based on the ingress label and a second route lookup based on the destination IP address.

Answer: A

Explanation:

http://packet-lab.com/main/service-provider/ccip/item/89-mpls-penultimate-hop-popping.html

NEW QUESTION 11
Refer to the partial Cisco IOS router configuration exhibit.

Which type of tunnel configuration is shown?

• A. GRE tunnel
• B. manual 6in4 tunnel
• C. 6to4 automatic tunnel
• D. 6RD
• E. IPv4-in-IPv6 tunnel

Answer: B

Explanation:
http://www.networking-forum.com/blog/?p=24

NEW QUESTION 12
When configuring an ACL entry, which network and wildcard mask matches only IP addresses 10.8.144.0 to 10.8.151.255?

• A. 10.8.144.0 0.0.3.255
• B. 10.8.144.0 0.0.7.255
• C. 10.8.144.0 0.0.15.255
• D. 10.8.144.0 0.0.252.255
• E. 10.8.144.0 0.0.248.255
• F. 10.8.144.0 0.0.240.255

Answer: B

NEW QUESTION 13
When is a route-policy configuration needed on a Cisco IOS XR router using RPL?

• A. when enabling an IGP routing protocol configuration
• B. when enabling an EBGP peering configuration
• C. when enabling an IBGP peering configuration
• D. when enabling route redistribution
• E. when enabling an LDP peering configuration

Answer: B

Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37rpl.pdf

NEW QUESTION 14
What do both Carrier Grade NAT and NAT64 have in common?

• A. both are only used in carrier networks
• B. both are used for tunneling IPv6 in an IPv4 network
• C. both require the use IPv6
• D. both are methods for avoiding IPv4 address exhaustion

Answer: D

NEW QUESTION 15
Which three statements about access control lists on a Cisco IOS router are true? (Choose three)

• A. The more specific ACL entries should be placed at the top of the ACL.
• B. The generic ACL entries should be placed at the top of the ACL, to filter general traffic and reduce noise on the network.
• C. ACLs always search for the most specific entry before taking any filtering action.
• D. Router-generated packets cannot be filtered by the interface ACLs on the router.
• E. Extended ACLs should be placed as close to the destination as possible.
• F. There must be at least one permit statement in an ACL, or all traffic is denied.

Answer: ADF

NEW QUESTION 16
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

NEW QUESTION 17
Which configuration error within an AS can cause a Cisco IOS XR router to not announce certain
prefixes to its EBGP peers?

• A. Some prefixes were mistagged with the no-export BGP community.
• B. Some prefixes were set with a MED of 0.
• C. The outbound BGP route policy has only set actions that are defined without any pass actions that are defined.
• D. The inbound BGP route policy has only set actions that are defined without any pass actions that are defined.

Answer: A

NEW QUESTION 18
Refer to the show command exhibit.

Which statement is true?

• A. It shows the result of the target configuration merged with the running configuration.
• B. It shows the contents of the uncommitted configuration.
• C. It shows the contents of the failed configuration.
• D. It shows the contents of the running configuration.

Answer: B

Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.6/system_management/command/reference/ yr36conf.pdf
To display information about the current configuration session (target configuration), use the show configuration command in any configuration mode. show configuration [merge] [running]

NEW QUESTION 19
After configuring Q-in-Q on a new interface, the customer has requested that the IOS version and remote model also be viewable via the trunk. What additional command would need to be applied to both sides of the Q-in-Q trunk?

• A. l2protocol-tunnel cdp
• B. l2protocol-tunnel stp
• C. l2protocol-tunnel vtp
• D. l2protocol-tunnel lldp
• E. l2protocol-tunnel odr

Answer: A

NEW QUESTION 20
Select and Place:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 21
On Cisco IOS XR software, which two of the address-family command options in IS-IS configuration mode are valid? (Choose two)

• A. address-family clns
• B. address-family ipv4 unicast
• C. address-family ipv6 unicast
• D. address-family vpnv4
• E. address-family vpnv6

Answer: BC

Explanation:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38isis.pdf To enter address family configuration mode for configuring Intermediate System-to-Intermediate System (IS-IS) routing that use standard IP Version 4 (IPv4) and IP Version 6 (IPv6) address prefixes, use the address-family command in router configuration or interface configuration mode. To disable support for an address family, use the no form of this command. Address family {ipv4 | ipv6} {unicast | mulitcast} no address-family {ipv4 | ipv6} {unicast | multicast}

NEW QUESTION 22
Which three statements about OSPFv2 or OSPFv3 authentication are true? (Choose three.)

• A. On Cisco IOS XR platforms, OSPFv3 authentication can be configured at the OSPF routing process, area, or interface level.
• B. OSPF authentication on Cisco IOS and IOS XE platforms can be configured per area or per interface.
• C. On Cisco IOS and IOS XE and IOS XR platforms, the authentication key can only be configured per interface.
• D. OSPFv3 uses IPsec for authentication and encryption.
• E. On Cisco IOS XR platforms, the OSPF authentication that is configured for the area overrides the authentication that is configured for the interface.
• F. On Cisco IOS and IOS XE platforms, the two OSPFv2 authentication methods that are supported are MD5 and SHA1.

Answer: ABD

Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37ospf.html

NEW QUESTION 23
Refer to the exhibit.

Which three commands are required on interface fastethernet 5/6 in order to create a trunk link between another Cisco Catalyst Switch? (Choose three.)

• A. no shutdown
• B. switchport mode trunk
• C. encapsulation trunk
• D. switchport trunk encapsulation dot1Q
• E. switchport trunk enable
• F. no switchport
• G. interface fastethernet 5/6 trunk
• H. switchport trunk allow dot1Q

Answer: ABD

NEW QUESTION 24





Hot Area:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

multiple spanning-tree protocol
Use the "show spanning-tree" command to see the "Spanning tree enabled protocol mstp" output.

NEW QUESTION 25
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