Cisco 640-878 Courses 2021

NEW QUESTION 1
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 2
Your switch network has been configured to support multiple VLANs. In order for the users on one VLAN to communicate with users on another VLAN, which additional configuration is required?

• A. Enable a routing protocol like EIGRP on a router or on a Layer 3 capable switch
• B. Enable inter-VLAN routing on a router or on a Layer 3 capable switch
• C. Enable a switch virtual interface on the router, using the interface vlan global configuration command
• D. Enable a switch virtual interface on the switch, using the encapsulation dot1q
• E. subinterface configuration command
• F. Enable IP routing on a Layer 2 switch

Answer: B

NEW QUESTION 3
What is the advantage of running IOS-XE individual consolidated packages versus subpackages?

• A. decreases storage requirements
• B. optimizes router memory usage
• C. simplified installation
• D. lowers CPU utilization

Answer: B

NEW QUESTION 4
Within an MPLS domain, which table is used by the ingress edge LSR to make forwarding decisions when an unlabeled IP packet is received?

• A. FIB
• B. LFIB
• C. LIB
• D. MP-BGP
• E. VRF

Answer: A

Explanation:

NEW QUESTION 5
A VLAN is a logical grouping of switch ports that belong to which two of these? (Choose two.)

• A. the same virtual switch cluster
• B. the same IP subnet
• C. the same collision domain
• D. the same broadcast domain
• E. the same virtual routing and forwarding instance

Answer: BD

NEW QUESTION 6
Refer to the exhibit.

Which three statements about MPLS LDP operations are true?

• A. The incoming label for 10.2.10.1/32 is 16010 (which is allocated by the local router), and theoutgoing label is 22 (as advertised by the next-hop router).
• B. The 16003 and 16010 labels are learned from the 192.168.112.40 LDP neighbor.
• C. The ImpNull outgoing label for the 192.168.102.0/24 network means that the outgoing label should be removed when sending packets to the 192.168.112.40 next-hop router, when the incoming label is 16003.
• D. The ImpNull outgoing label for the 192.168.102.0/24 network means that the local router has not received a label for that network from its neighbor.
• E. The Unlabeled outgoing label for 10.10.10.100/32 indicates that a label pop is required when sending packets to the 10.10.10.1 next-hop router.
• F. The outgoing label of 22 for 10.2.10.1/32 is learned from the 192.168.112.40 LDP neighbor.

Answer: ACF

Explanation:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ldp_221t.html

NEW QUESTION 7
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 8
Refer to the partial Cisco IOS router configuration exhibit.

Which statement is true?

• A. To support the subinterface configuration, the Fa0/0 main interface configuration is missing the encapsulation dot1Q command.
• B. The Fa0/0 interface/subinterfaces are configured correctly to operate as a trunk port to provide inter-VLAN routing for three VLANs (VLANs 1, 2, and 3).
• C. To provide inter-VLAN routing, the Fa0/0.1, Fa0/0.2 and Fa0/0.3 subinterface configuration is missing the encapsulation dot1Q vlan-id subinterface configuration command.
• D. To provide inter-VLAN routing, the router is missing the vlan 1, vlan 2, and vlan 3 global configuration commands.

Answer: C

NEW QUESTION 9
Which statement is true about enabling IS-IS routing and using the net command to configure the NSAP address?

• A. NSAP addresses have a fixed size of 20 bytes.
• B. The NSEL must always be 00 to identify the router.
• C. The area address follows the system ID field before the NSEL field.
• D. An AFI of 39 indicates that the AFI is a locally administered private address.

Answer: B

Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a00800a3e6f.shtml

NEW QUESTION 10
Refer to the topology diagram in the exhibit.

Which two interface configuration commands on the Cisco ME 3400-1 switch Fa 0/1 interface are required to support the VLANs for Customer A to be trunked across the service provider network? (Choose two.)

• A. switchport access vlan 30
• B. switchport mode trunk
• C. switchport mode dot1q-tunnel
• D. switchport trunk allowed vlan 1-100

Answer: AC

Explanation:
http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_25_ex/configurat ion/guide/swtunnel.html

NEW QUESTION 11
Which spanning-tree mode can be used to map several VLANs to a single spanning-tree instance?

• A. MST
• B. PVST+
• C. PVRST+
• D. RSTP

Answer: A

NEW QUESTION 12
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 13
On Cisco IOS XR software, how is LDP enabled on an interface?

• A. LDP is automatically enabled globally on all interfaces, when ip cef is enabled globally.
• B. LDP is enabled on each interface, using the mpls ip interface configuration command.
• C. LDP is enabled on each interface, using the interface command under mpls ldp (MPLS LDP configuration mode).
• D. LDP is enabled globally on all interfaces, using the mpls ldp global configuration command.
• E. LDP is enabled globally on all interfaces, using the mpls ip global configuration command.

Answer: C

Explanation:

http://www.cisco.com/en/US/docs/ios-xml/ios/mp_ldp/configuration/12-4m/mp-ldp-12-4m-book.pdf

NEW QUESTION 14
Select and Place:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 15
Select and Place:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 16
What is the foundation architecture of Cisco Next Generation Networks?

• A. IP/MPLS
• B. IP SLA
• C. TRILL
• D. REP

Answer: A

NEW QUESTION 17
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 18
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 19
Which statement about Cisco IOS XE software is true?

• A. It uses a two-stage configuration process.
• B. It is identical in look and feel to Cisco IOS software.
• C. It runs on the Cisco ASR 9010 platform.
• D. Packages can be added using the install add and install activate commands.
• E. It runs on the Cisco ME 3400 platform.

Answer: B

Explanation:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps9442/ps11192/ps11194/QA_C67- 622903.html
The IOS feature set for routing and switching is unmatched in the industry, delivering functionality required for business critical applications. Preserving these advantages of IOS to our customers is critical for Cisco. IOS XE retains the exact same look and feel of IOS, while providing enhanced future-proofing and improved functionality. In IOS XE, IOS 15.0 runs as a single daemon within a modern Linux operating system. Additional system functions now run as additional, separate processes in the host OS environment. The operation, support and management of IOS XE does not require re-training from classic IOS.

NEW QUESTION 20
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 10.1.1.1 TCP port 1060, if they are routed to the Gi0/0/0/0 interface, will be permitted? (Choose four)

• A. destination IP address: 192.168.15.37, destination TCP port: 8080
• B. destination IP address: 192.168.15.41, destination TCP port: 8080
• C. destination IP address: 192.168.15.49, destination TCP port: 8080
• D. destination IP address: 192.168.15.36, destination TCP port: 80
• E. destination IP address: 192.168.15.46, destination TCP port: 80
• F. destination IP address: 192.168.15.49, destination TCP port: 80

Answer: CDEF

NEW QUESTION 21
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 22
What command will install the image needed on the Cisco IOS-XR if the SSH configuration options are unavailable?

• A. install activate disk0:c12k-k9sec.pie-4.1.2
• B. install activate disk0:c12k-diags.pie-4.1.2
• C. install commit disk0:c12k-diags.pie-4.1.2
• D. install ssh activate disk0:c12k-k9sec.pie-4.1.2

Answer: A

NEW QUESTION 23
Refer to the partial Cisco IOS-XR configuration. What is the purpose of the for PFX to PEER command?
!
mpls ldp label advertise
disable
for PFX to PEER
!<output omitted>
!

• A. To selectively enable LDP peering(s) with specific neighbors
• B. To selectively disable LDP peering(s) with specific neighbors
• C. To perform outbound filtering for local label advertisement for one or more prefixes to one or more peers
• D. To perform inbound filtering for local label advertisement for one or more prefixes from one or more peers

Answer: C

NEW QUESTION 24
Which Cisco platform runs the Cisco IOS XE operating system?

• A. Cisco ASR9K
• B. Cisco CRS
• C. Cisco 12000 GSR
• D. Cisco ASR1K
• E. Cisco ME 3400
• F. Cisco ISR-G2

Answer: D

Explanation:
http://www.cisco.com/en/US/prod/collateral/routers/ps9343/product_bulletin_c25-448387.html

NEW QUESTION 25
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 26
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