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2021 Nov cisco ccna 640-878 song 2:

Q31. 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 

Answer: C 


Q32. 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 


Q33. 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 

Answer: A 


Q34. Which four statements about REP configurations on a Cisco ME 3400 switch port are true? 

 (Choose four.) 

A. The port must be an NNI type and must be in trunk mode. 

B. Use the rep segment number command to enable REP on the switch port. 

C. A REP segment cannot be wrapped into a ring topology. REP supports only a topology where each REP segment has two exit points via two edge switches. 

D. The port where the segment terminates is called the edge port. 

E. With REP, at least one port is always blocked in any given segment-that is, the alternate port. 

F. If a failure occurs within the segment, the blocked port goes to the forwarding state after it goes through the listening state and the learning state. 

Answer: A,B,D,E 


Update cisco ccna 640-878 song 2:

Q35. 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. 

Answer: B,E 


Q36. 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: A,B,D 


Q37. 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-XR interface GigabitEthernet 0/0/0/0 ip address 192.0.2.3 255.255.255.0 router hsrp interface GigabitEthernet 0/0/0/0 hsrp 1 ipv4 192.0.2.1 hsrp 1 priority 95 hsrp 1 preempt hsrp 2 ipv4 192.0.2.254 hsrp 2 priority 105 hsrp 2 preempt 

B. 

! IOS-XR interface GigabitEthernet 0/0/0/0 ip address 192.0.2.1 255.255.255.0 router hsrp interface GigabitEthernet 0/0/0/0 hsrp 1 ipv4 192.0.2.1 hsrp 1 priority 99 hsrp 1 preempt hsrp 2 ipv4 192.0.2.254 hsrp 2 priority 101 hsrp 2 preempt 

C. 

! IOS-XR interface GigabitEthernet 0/0/0/0 ip address 192.0.2.3 255.255.255.0 router hsrp interface GigabitEthernet 0/0/0/0 hsrp 1 ipv4 192.0.2.1 hsrp 1 priority 1 hsrp 1 preempt hsrp 2 ipv4 192.0.2.254 hsrp 2 priority 1 hsrp 2 preempt 

D. 

! IOS interface GigabitEthernet 0/0 ip address 192.0.2.2 255.255.255.0 standby 1 ip 192.0.2.1 standby 1 priority 105 standby 1 preempt standby 2 ip 192.0.2.254 standby 2 priority 95 standby 2 preempt ! IOS interface GigabitEthernet 0/0 ip address 192.0.2.254 255.255.255.0 standby 1 ip 192.0.2.1 standby 1 preempt standby 2 ip 192.0.2.254 standby 2 preempt 

E. 

! IOS interface GigabitEthernet 0/0 ip address 192.0.2.2 255.255.255.0 standby 1 ip 192.0.2.1 standby 1 preempt standby 1 priority 2 standby 2 ip 192.0.2.254 standby 2 preempt standby 2 priority 2 

Answer: A,D 


Q38. 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. 

Answer: C,E 


Q39. Which statement about the benefits of MPLS PHP is true? 

A. PHP is implemented to increase the performance on the egress edge LSR. PHP allows the egress edge LSR to perform only one lookup to route the IP packet based on destination IP address and routing table. 

B. PHP is implemented to increase the performance on the egress edge LSR. PHP enables the egress edge LSR to perform only one lookup based on the ingress label. 

C. PHP is implemented to increase the performance on the egress edge LSR. 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. 

D. 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. 

E. 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. 

F. 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. 

G. PHP is implemented to increase the performance on the ingress edge LSR. PHP enables the ingress edge LSR to perform only one lookup based on the ingress label. 

H. PHP is implemented to increase the performance on the ingress edge LSR. 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