Computer Networks exam 2 – updated
2024/2025 Q&a BaNk
◉ What does a class C IP address consist of? Answer: 110 | network | host
192.0.0.0 to 223.255.255.255
◉ What does a class D IP address consist of? Answer: 1110 | multicast address
224.0.0.0 to 239.255.255.255
◉ How does an ISP get its IP addresses? How does a customer network get its
IP addresses? How does a host get its IP addresses? Answer: From IANA
(Internet Assigned Numbers Authority)
From its ISP
Manual configuration, DHCP
◉ What is the Internet Protocol (IP) service model? Answer: Provides
datagram service to transport layer, host-to-host connectivity
(connectionless), best-effort packet delivery
, ◉ What is CIDR? Answer: Classless InterDomain Routing, a solution to the
IPv4 problem.
◉ What is a subnet? Answer: device interfaces with the same subnet part of
the IP address. Can physically reach each other without intervening router
◉ How do you determine the subnet? Answer: detach each interface from its
host or router, creating islands of isolated networks (each one is called a
subnet)
◉ Dijkstra's Algorithm Answer: Link costs known to all nodes, computes least
cost paths from one source node, iterative.
c(x,y) = link cost from node x to y
D(v) = current value of cost of path from source to dest v
p(v) = predecessor node along path from source to v
◉ Bellman-Ford algorithm Answer: dx(y) = cost of least-cost path from x to y
dx(y) = min{c(x,v) + dv(y)}
◉ What is ICMP? Answer: Internet Control Message protocol.
2024/2025 Q&a BaNk
◉ What does a class C IP address consist of? Answer: 110 | network | host
192.0.0.0 to 223.255.255.255
◉ What does a class D IP address consist of? Answer: 1110 | multicast address
224.0.0.0 to 239.255.255.255
◉ How does an ISP get its IP addresses? How does a customer network get its
IP addresses? How does a host get its IP addresses? Answer: From IANA
(Internet Assigned Numbers Authority)
From its ISP
Manual configuration, DHCP
◉ What is the Internet Protocol (IP) service model? Answer: Provides
datagram service to transport layer, host-to-host connectivity
(connectionless), best-effort packet delivery
, ◉ What is CIDR? Answer: Classless InterDomain Routing, a solution to the
IPv4 problem.
◉ What is a subnet? Answer: device interfaces with the same subnet part of
the IP address. Can physically reach each other without intervening router
◉ How do you determine the subnet? Answer: detach each interface from its
host or router, creating islands of isolated networks (each one is called a
subnet)
◉ Dijkstra's Algorithm Answer: Link costs known to all nodes, computes least
cost paths from one source node, iterative.
c(x,y) = link cost from node x to y
D(v) = current value of cost of path from source to dest v
p(v) = predecessor node along path from source to v
◉ Bellman-Ford algorithm Answer: dx(y) = cost of least-cost path from x to y
dx(y) = min{c(x,v) + dv(y)}
◉ What is ICMP? Answer: Internet Control Message protocol.
