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640-878 by Cisco - Page 1 | ExamCademy

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On Cisco IOS XR software, what are the four valid address-family configuration command options in static route configuration mode? (Choose four.)

A address-family ipv4 unicast
B address-family ipv6 unicast
C address-family ipv4 multicast
D address-family ipv6 multicast
E address-family vpnv4
F address-family vpnv6

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

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

Which two statements about NAT444 are true? (Choose two.)

A NAT444 packets are translated three times.
B NAT packets traverse three IPv4 addressing domains.
C NAT444 needs to work together with DNS64.
D There are two types of NAT444 (stateful or stateless).
E NAT is performed by the CPE and also by the service provider router.

Which two statements about NAT64 are true? (Choose two.)

A NAT64 packets traverse two IPv4 addressing domains.
B NAT64 packets are translated two times.
C There are two types of NAT64 (stateful or stateless).
D NAT is performed by the CPE and also by the service provider edge router.
E The DNS64 server embeds the IPv4 address from the DNS A record with a preconfigured IPv6 translation prefix.

Refer to the exhibit.

Question Image

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

Refer to the exhibit.

Question Image

The access list has been configured on the Gi0/0/0/0 interface in the inbound direction. Which two packets that are sourced from 172.16.1.1 TCP port 1050, if they are routed to the Gi0/0/0/0 interface, will be permitted? (Choose two)

A destination IP address: 10.10.192.201, destination TCP port: 80
B destination IP address: 10.10.193.255, destination TCP port: 80
C destination IP address: 10.10.196.1, destination TCP port: 80
D destination IP address: 10.10.195.254, destination TCP port: 23
E destination IP address: 10.10.193.145, destination TCP port: 23
F destination IP address: 10.10.197.32, destination TCP port: 23

Which first-hop router redundancy protocol uses the active virtual gateway to assign a virtual MAC address to the active virtual forwarders?

A HSRP
B VRRP
C GLBP
D FHRP

Which two statements about the BGP weight attribute on Cisco routers are true? (Choose two.)

A It is a well-known discretionary attribute.
B It is only locally significant.
C Routes with higher weight are the preferred routes.
D It is used to influence the inbound traffic from the upstream AS.
E It is set to 100 by default.

Which BGP attribute is also used for loop prevention?

A weight
B local preference
C MED
D AS path

The permit 172.16.32.0 0.0.15.255 access-list entry permits exactly which IP address range?

A 172.16.32.0 to 172.16.47.255
B 172.16.32.0 to 172.16.48.255
C 172.16.32.0 to 172.16.62.255
D 172.16.32.0 to 172.16.63.255
E 172.16.32.0 to 172.16.64.255
F 172.16.32.0 to 172.16.255.255

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

During the BGP route selection process on Cisco routers, which BGP attribute is examined first, to determine the best path to use?

A AS path
B MED
C local preference
D weight
E origin

Which type of service provider is responsible for offering backbone connectivity services to other service providers?

A CSP
B TSP
C NSP
D ISP
E ASP

Cisco IP NGN service providers can offer multiple services to their customers by using which type of technology in their core networks?

A ATM
B SONET/SDH
C Frame Relay
D IP/MPLS
E PBB

Refer to the Cisco IOS XR commands exhibit.

Question Image

The router administrator is trying to activate a software package on the router but is not able to do so. Which statement about this problem is true?

A The router needs to be in the global configuration mode.
B The router needs to be in the admin global configuration mode.
C The router needs to be in the admin EXEC mode.
D The install activate command is not the correct command to use.
E The administrator needs to log in as the "root" user instead of the "admin" user.

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

A LDP
B IS-IS
C BGP
D OSPF

You are enabling OSPF on a router and notice that all the Fast Ethernet and the Gigabit Ethernet interfaces have the same OSPF cost of 1. Which single configuration change can you make in router ospf configuration mode so that the Fast Ethernet interfaces have a higher OSPF cost than the Gigabit Ethernet interfaces?

A Change the OSPF interface cost globally.
B Change the OSPF default metric.
C Change the OSPF auto-cost reference bandwidth.
D Change the OSPF administrative distance.
E Change the OSPF metric type from E2 to E1.

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 1area 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 1area 0network 192.168.1.0

Refer to the two show output examples below. The switch with the e8ba.70b5.7180 MAC address is the root bridge for which VLAN or VLANs?

Question Image

A VLAN 1
B VLAN 70
C VLAN 80
D VLANs 1, 70, and 80
E VLANs 1 and 70
F VLANs 1 and 80

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.

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.

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.

You have installed a new router and configured OSPF on it. However, this new router is not able to establish an OSPF neighbor relationship with the neighbor
OSPF router. Which four conditions could cause this problem? (Choose four.)

A mismatched OSPF hello/dead interval between the new router and the neighbor router
B mismatched OSPF area ID between the new router and the neighbor router
C mismatched OSPF authentication data between the new router and the neighbor router
D mismatched OSPF router ID between the new router and the neighbor router
E mismatched interface MTU between the new router and the neighbor router
F mismatched interface bandwidth between the new router and the neighbor router

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