Latest 640-878 Dumps 2021

NEW QUESTION 1
On the Cisco ME 3400 switch, spanning tree is enabled by default on which type of switch port?

• A. UNI
• B. ENI
• C. NNI
• D. ENI and NNI
• E. UNI, ENI, and NNI

Answer: C

Explanation:

http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_25_seg_seg1/co nfiguration/guide/swstpopt.html#wp1002608

NEW QUESTION 2
A company begins offering SIP and PRI trunks to customers. Which type of Service Provider is this?

• A. Managed Service Provider
• B. Internet Service Provider
• C. Telecommunications Service Provider
• D. Distributed Networking Service Provider

Answer: C

NEW QUESTION 3
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 4
A service provider needs to implement a managed CE device that supports Cisco IOS ISSU, and the current CE support staff is highly trained in Cisco IOS only. Which Cisco router platform should the service provider implement as the managed CE device?

• A. Cisco ASR1K
• B. Cisco ISR-G2
• C. Cisco ASR9K
• D. Cisco 12000 GSR
• E. Cisco 7200
• F. Cisco 7600

Answer: A

Explanation:

NEW QUESTION 5
Refer to the configuration snippet below. A network engineer has been tasked with implementing a security policy that prevents subnet 209.165.202.128/27 from accessing web server 209.165.200.224. All users are now unable to access the web server. What command is missing from the access list configuration?
Configuration:
switch(config)#access-list 1 deny 209.165.202.128 0.0.0.31 209.165.200.224 switch(config)#interface FastEthernet 0/0
switch(config-if)# ip access-group 1 in

• A. switch(config-if)#ip access-group 1 out
• B. switch(config)#ip access-list 2 permit any any
• C. switch#ip access-list 2 permit any any
• D. switch(config)#ip access-list 1 permit any any

Answer: D

NEW QUESTION 6
Select and Place:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 7
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 they cannot ping 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

NEW QUESTION 8





Hot Area:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

vlan 80
Use the "show spanning-tree mst" command on each switch to see the vlans mapped to each MST.

NEW QUESTION 9
What is the foundation architecture of Cisco Next Generation Networks?

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

Answer: A

NEW QUESTION 10
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 192.168.1.1/24?

• A. router ospf 1network 192.168.1.1 0.0.0.0 area 0
• B. router ospf 1network 192.168.1.1 255.255.255.255 area 0
• C. router ospf 1 area 0interface gi0/0/0/0
• D. router ospfv3 1network 192.168.1.1 0.0.0.0 area 0
• E. router ospfv3 1network 192.168.1.1 255.255.255.255 area 0
• F. router ospfv3 1 area 0network 192.168.1.0
• G. router ospfv3 1 area 0interface gi0/0/0/0

Answer: C

NEW QUESTION 11
Which spanning-tree mode uses the name command to configure a region name?

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

Answer: A

NEW QUESTION 12
A customer has been allocated a new VLAN on a new Layer 3 switch. After configuring the Switched Virtual Interface, what additional two configurations are required to ensure the switch can route packets to the Internet through a gateway with IP address of 209.165.200.250? (Choose two.)

• A. IP default-gateway 209.165.200.250
• B. IP routing
• C. IP route 0.0.0.0 0.0.0.0 209.165.200.250
• D. IP routing 0.0.0.0 0.0.0.0 209.165.200.250
• E. IP networking

Answer: BC

NEW QUESTION 13
Select and Place:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 14
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 15
Which BGP attribute is also used for loop prevention?

• A. weight
• B. local preference
• C. MED
• D. AS path

Answer: D

Explanation:

As RFC 4271 says, "AS loop detection is done by scanning the full AS path (as specified in the AS_PATH attribute), and checking that the autonomous system number of the local system does not appear in the AS path".

NEW QUESTION 16
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 17
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 18
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 19
You want to configure HSRP between a Cisco IOS and a Cisco IOS XR router for the 192.0.2.0/24 subnet. Half of the PCs on the 192.0.2.0/24 subnet are configured to use 192.0.2.1 as the default gateway, and the other half of the PCs are configured to use 192.0.2.254 as the default gateway. The intent is to load balance the traffic across both routers.
Which two IOS and IOS XR configurations are needed? (Choose two.)

• A. ! IOS-XRinterface GigabitEthernet 0/0/0/0ip address 192.0.2.3 255.255.255.0router hsrpinterface GigabitEthernet 0/0/0/0 hsrp 1 ipv4 192.0.2.1hsrp 1 priority 95hsrp 1 preempthsrp 2 ipv4 192.0.2.254hsrp 2 priority 105hsrp 2 preempt
• B. ! IOS-XRinterface GigabitEthernet 0/0/0/0ip address 192.0.2.1 255.255.255.0router hsrpinterface GigabitEthernet 0/0/0/0 hsrp 1 ipv4 192.0.2.1hsrp 1 priority 99hsrp 1 preempthsrp 2 ipv4 192.0.2.254hsrp 2 priority 101hsrp 2 preempt
• C. ! IOS-XRinterface GigabitEthernet 0/0/0/0ip address 192.0.2.3 255.255.255.0router hsrpinterface GigabitEthernet 0/0/0/0 hsrp 1 ipv4 192.0.2.1hsrp 1 priority 1hsrp 1 preempthsrp 2 ipv4 192.0.2.254hsrp 2 priority 1hsrp 2 preempt
• D. ! IOSinterface GigabitEthernet 0/0ip address 192.0.2.2 255.255.255.0standby 1 ip 192.0.2.1standby 1 priority 105standby 1 preemptstandby 2 ip 192.0.2.254standby 2 priority 95standby 2 preempt
• E. ! IOSinterface GigabitEthernet 0/0ip address 192.0.2.254 255.255.255.0standby 1 ip 192.0.2.1standby 1 preemptstandby 2 ip 192.0.2.254standby 2 preempt
• F. ! IOSinterface GigabitEthernet 0/0ip address 192.0.2.2 255.255.255.0standby 1 ip 192.0.2.1standby 1 preemptstandby 1 priority 2standby 2 ip 192.0.2.254standby 2 preemptstandby 2 priority 2

Answer: AD

NEW QUESTION 20
Select and Place:

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 21
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 22
Which IOS Software solution is used for transporting RFC 1918 networks via IPSec + GRE VPNs over the internet?

• A. Dynamic Multipoint VPN
• B. Group Encrypted Transport VPN
• C. IPS
• D. URL Filtering

Answer: A

NEW QUESTION 23
What platform is best placed as the edge device within the Cisco Service Provider Next Generation Network architecture running IOS-XE?

• A. ASR 9000
• B. Catalyst 6509
• C. 2921 Router
• D. C3560G
• E. Catalyst 7609

Answer: A

NEW QUESTION 24
Which file extension indicates a bootable installation file in Cisco IOS XR software?

• A. .bin
• B. .tar
• C. .smu
• D. .pie
• E. .vm
• F. .mini

Answer: E

Explanation:

NEW QUESTION 25
ISPs use which protocol to establish peering sessions in an Internet exchange point environment?

• A. LDP
• B. IS-IS
• C. BGP
• D. OSPF

Answer: C

NEW QUESTION 26
......