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2021 Feb 4A0-100 exam

Q61. As described by the CSMA/CD algorithm, what is the first thing to happen when Host A and Host B begin transmitting data at the same time? 

A. Host A and B will generate a jam signal. 

B. Listening hosts will request retransmission. 

C. Host A or B will retry the transmission. 

D. A back-off timer is started by Host A or B. 

Answer:


Q62. Which statement accurately explains the purpose of the TCP protocol and what it provides? 

A. The primary purpose of TCP is to provide reliable communications between application services. 

B. The primary purpose of TCP is to provide unreliable communications between application services 

C. The primary purpose of TCP is to provide IP routing between application services. 

D. The primary purpose of TCP is to define the correct format for the application layer such as JPEG or HTML. 

Answer:


Q63. What is NOT a function ofthe IOM? 

A. It forwards the data to the switch fabric. 

B. It discards excess data packets. 

C. It converts the incoming data to an internal format. 

D. It performs Quality of Service operations and buffers incoming data. 

Answer:


Q64. Which protocol is used by ping to verify IP network reachability? A. DCHP 

B. ICMP 

C. ARP 

D. NAT 

Answer:


Q65. Which of the following statements is TRUE about ICMP? 

A. An IP datagram is encapsulated within an ICMP header. 

B. ICMP messages can only be generated by routers. 

C. ICMP messages are encapsulated within an IP datagram. 

D. ICMP guarantees delivery of a message. 

Answer:


Far out 4A0-100 study guide:

Q66. Which of the following applications would be likely to use UDP? 

A. Real-time audio application, such as VoIP 

B. Web browser 

C. Email application 

D. Telnet 

Answer:


Q67. What is required if devices on different VLANs wish to communicate with each other? 

A. Devices on different VLANs cannot communicate with each other. 

B. Devices on different VLANs can communicate with each other as long as they are connected to the same switch. 

C. Devices on different VLANs can communicate with each other as long as the switches they are attached to are connected to each other with an Ethernet connection. 

D. Devices on different VLANs can communicate with each other if there is an IP router to connect the VLANs. 

Answer:


Q68. What protocol is used by ping to verify IP network reachability? 

A. DCHP 

B. ICMP 

C. ARP 

D. NAT 

Answer:


Q69. If a 4-port LAG is configured with the option of 'port-threshold 2' and 'action down' what will 

happen if the total operational links in the LAG is 2? 

A. If dynamic-cost is enabled it will adjust the cost for routing protocols such as OSPF. 

B. If dynamic-cost is not enabled it will adjust the cost for routing protocols such as OSPF by dividing the link bandwidth by 2. 

C. The LAG will be changed to an operational state of 'down'. 

D. The LAG will function with only 2 ports. There will be no change to the routing metric. 

Answer:


Q70. What operation is performed by an LSR when it receives an MPLS labeled packet? 

A. The LSR refers to its routing table and forwards the packet to the next LSR or LER without altering the MPLS label. 

B. The LSR refers to its MPLS label table, swaps the label and forwards the packet to the next LSR or LER. 

C. The LSR refers to its MPLS label table forwards the packet to the next LSR or LER without altering the MPLS label. 

D. The LSR refers to its MPLS label table, pops the label and forwards the packet to the next IP router. 

Answer: