NET 125 Test Questions with Correct Answers Latest Update 2025/2026
What IPv4 header field identifies the upper layer protocol carried in the packet? - Answers
Protocol
What are two services provided by the OSI network layer? (two answers) - Answers
Encapsulating PDUs from the transport layer and routing packets toward the destination
What routing table entry has a next hop address associated with a destination network? -
Answers remote routes
Within a production network, what is the purpose of configuring a switch with a default gateway
address? - Answers The default gateway address is used to forward packets originating from
the switch to remote networks.
A computer can access devices on the same network but cannot access devices on other
networks. What is the probable cause of this problem? - Answers The computer has an invalid
default gateway address.
Which field in the IPv4 is used to prevent a packet from traversing a network endlessly? -
Answers Time-to-Live
What is basic characteristic of the IP protocol? - Answers connectionless
Which statement describes a feature of the IP protocol? - Answers IP relies on upper layer
services to handle situations of missing or out-of-order packets.
Under which two circumstances will a switch flood a frame out of every port except the port that
the frame was received on? (Choose two.) - Answers 1. The frame has the broadcast address
as the destination address.
2. The destination address is unknown to the switch.
Which destination address is used in an ARP request frame? - Answers FFFF.FFFF.FFFF
Which statement describes the treatment of ARP requests on the local link? - Answers They are
received and processed by every device on the local network.
What is the aim of an ARP spoofing attack? - Answers to associate IP addresses to the wrong
MAC address
What statement describes the function of the Address Resolution Protocol? - Answers ARP is
used to discover the MAC address of any host on the local network.
configures a name on the router - Answers Router(config)# hostname CL1
displays a message after accessing the router - Answers Router(config)# banner motd #
What IPv4 header field identifies the upper layer protocol carried in the packet? - Answers
Protocol
What are two services provided by the OSI network layer? (two answers) - Answers
Encapsulating PDUs from the transport layer and routing packets toward the destination
What routing table entry has a next hop address associated with a destination network? -
Answers remote routes
Within a production network, what is the purpose of configuring a switch with a default gateway
address? - Answers The default gateway address is used to forward packets originating from
the switch to remote networks.
A computer can access devices on the same network but cannot access devices on other
networks. What is the probable cause of this problem? - Answers The computer has an invalid
default gateway address.
Which field in the IPv4 is used to prevent a packet from traversing a network endlessly? -
Answers Time-to-Live
What is basic characteristic of the IP protocol? - Answers connectionless
Which statement describes a feature of the IP protocol? - Answers IP relies on upper layer
services to handle situations of missing or out-of-order packets.
Under which two circumstances will a switch flood a frame out of every port except the port that
the frame was received on? (Choose two.) - Answers 1. The frame has the broadcast address
as the destination address.
2. The destination address is unknown to the switch.
Which destination address is used in an ARP request frame? - Answers FFFF.FFFF.FFFF
Which statement describes the treatment of ARP requests on the local link? - Answers They are
received and processed by every device on the local network.
What is the aim of an ARP spoofing attack? - Answers to associate IP addresses to the wrong
MAC address
What statement describes the function of the Address Resolution Protocol? - Answers ARP is
used to discover the MAC address of any host on the local network.
configures a name on the router - Answers Router(config)# hostname CL1
displays a message after accessing the router - Answers Router(config)# banner motd #
