CS 457 Midterm Study || Answers 100% Rated Correct.
What is the difference between a packet and a frame? correct answers Depends on the context
where it is used:
-A frame is used in the link layer
-A packet is used in the network layer
What is a network? correct answers Two or more nodes connected through a link.
Two or more networks connected via two or more nodes.
Main characteristics of a LAN correct answers Multiple nodes connected to the same media
(link).
Broadcast network.
Which address is used by machines on the same LAN? correct answers Hardware address (MAC
address)
Circuit Switching vs Packet Switching correct answers Circuit Switching
-Dedicated path between communicating hosts is established before data is sent
-Can lead to inefficient utilization of resources
Packet Switching
-Statistically multiplexes multiple hosts on the same link
-Better at efficiently utilizing resources
Router vs Gateway correct answers Router
-Special nodes designed to determine where packets should be sent
-Has multiple NICs
Gateway
-Is a router
, -A router is called a geteway from the LAN's perspective
What is ARP? correct answers Address Resolution Protocol: maps an IP address to a MAC
address
What is DNS? correct answers Domain Name System - translates human-readable address into
an IP addresses
What are the two major functions of a router? correct answers Routing
Forwarding
What is layered design? correct answers Divide the network design problem into logically self-
contained sub-problems
-Each layer relies on services from below layers
-Each layer exports services to above layers
What is the difference between a standard host and a router in terms of layered design? correct
answers A router only needs to implement the network stack up to the network/IP layer (layer 3)
Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts
are separated by m meters, and suppose the propagation speed along the link is s meters/sec.
Host A is to send a packet of size L bits to Host B.
What is the propagation delay? correct answers Propagation delay is distance/velocity (d = m/s)
Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts
are separated by m meters, and suppose the propagation speed along the link is s meters/sec.
Host A is to send a packet of size L bits to Host B.
What is the difference between a packet and a frame? correct answers Depends on the context
where it is used:
-A frame is used in the link layer
-A packet is used in the network layer
What is a network? correct answers Two or more nodes connected through a link.
Two or more networks connected via two or more nodes.
Main characteristics of a LAN correct answers Multiple nodes connected to the same media
(link).
Broadcast network.
Which address is used by machines on the same LAN? correct answers Hardware address (MAC
address)
Circuit Switching vs Packet Switching correct answers Circuit Switching
-Dedicated path between communicating hosts is established before data is sent
-Can lead to inefficient utilization of resources
Packet Switching
-Statistically multiplexes multiple hosts on the same link
-Better at efficiently utilizing resources
Router vs Gateway correct answers Router
-Special nodes designed to determine where packets should be sent
-Has multiple NICs
Gateway
-Is a router
, -A router is called a geteway from the LAN's perspective
What is ARP? correct answers Address Resolution Protocol: maps an IP address to a MAC
address
What is DNS? correct answers Domain Name System - translates human-readable address into
an IP addresses
What are the two major functions of a router? correct answers Routing
Forwarding
What is layered design? correct answers Divide the network design problem into logically self-
contained sub-problems
-Each layer relies on services from below layers
-Each layer exports services to above layers
What is the difference between a standard host and a router in terms of layered design? correct
answers A router only needs to implement the network stack up to the network/IP layer (layer 3)
Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts
are separated by m meters, and suppose the propagation speed along the link is s meters/sec.
Host A is to send a packet of size L bits to Host B.
What is the propagation delay? correct answers Propagation delay is distance/velocity (d = m/s)
Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts
are separated by m meters, and suppose the propagation speed along the link is s meters/sec.
Host A is to send a packet of size L bits to Host B.
