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2021 Feb 640-875 syllabus:
Q41. Which three statements about the ARP function are true? (Choose three.)
A. ARP is used to determine an IP address.
B. An ARP request is broadcast at Layer 3.
C. An ARP response is broadcast at Layer 2.
D. ARP tables are maintained on Layer 3 devices.
E. The destination MAC address of an ARP request is that of the ARP responder.
F. ARP requests are broadcast at Layer 2.
G. ARP resolves MAC addresses to NET addresses.
H. ARP uses 0x0806 as the Type field in an Ethernet frame.
Answer: D,F,H
Explanation:
Q42. Given the IP address 10.106.170.145 255.248.0.0, which three options are the subnet that this IP address belongs to, the host IP address range on this subnet, and the subnet broadcast IP address?
A. subnet = 10.104.0.0/13
B. subnet = 10.106.0.0/13
C. subnet = 10.112.0.0/13
D. host IP address range = 10.104.0.1 to 10.111.255.254
E. host IP address range = 10.106.0.1 to 10.106.255.254
F. host IP address range = 10.106.0.1 to 10.119.255.254
G. subnet broadcast IP address = 10.106.255.255
H. subnet broadcast IP address = 10.111.255.255
I. subnet broadcast IP address = 10.119.255.255
Answer: A,D,H
Explanation:
Q43. Which statement about STP operations is true?
A. One root bridge exists per collision domain.
B. One root port is established per root bridge.
C. One designated port is defined per segment.
D. Non-designated ports are set in the forwarding state.
E. One root port exists per broadcast domain.
Answer: C
Explanation:
Renew cisco ccna 640-875 spngn1:
Q44. Refer to the exhibit.
Which statement about this show command output is true?
A. The S78 switch is performing remote-SPAN.
B. All traffic that ports Fa0/1, Fa0/2, Fa0/3, and Fa0/4 send and receive is monitored.
C. All traffic that port Gi0/1 sends and receives is monitored.
D. The sniffer (network analyzer) should be connected to the Gi0/1 port.
E. The SPAN destination interface replicates the source interface encapsulation method.
Answer: D
Explanation:
Q45. Which three statements about Cisco IOS XR CLI operations are true? (Choose three.)
A. Cisco IOS XR uses a three-stage configuration method.
B. Committed changes are persistent across reboots in Cisco IOS XR.
C. The commit replace global configuration command replaces the contents of the running configuration with the target configuration.
D. The save global configuration command saves the contents of target configuration to the running configuration.
E. There is no concept of a startup-config in Cisco IOS XR.
F. The clear global configuration command erases the entire current running configuration.
G. The show running-config global configuration command displays the configuration that occurs if the contents of the uncommitted changed (target configuration) are committed to the running configuration.
Answer: B,C,E
Explanation:
Q46. Given the IP address 172.16.170.15 255.255.224.0, which three options are the subnet that this IP address belongs to, the host IP address range on this subnet, and the subnet broadcast IP address? (Choose three.)
A. subnet = 172.16.160.0/19
B. subnet = 172.16.170.0/19
C. subnet = 172.16.192.0/19
D. host IP address range = 172.16.160.1 to 172.16.191.254
E. host IP address range = 172.16.170.1 to 172.16.170.254
F. host IP address range = 172.16.160.1 to 172.16.223.254
G. subnet broadcast IP address = 172.16.170.255
H. subnet broadcast IP address = 172.16.191.255
I. subnet broadcast IP address = 172.16.223.255
Answer: A,D,H
Explanation: