Computer Networks

Use this for “Which layer of the TCP/IP model does DNS belong to? And a switch?”

Use this for “A browser sends a request over TCP and Ethernet. In what order is it wrapped?”

Use this for “Split a /24 block into 5 equal subnets. What is their prefix, and how many hosts does each hold?”

Use this for “A TCP connection has a 64 KiB window and a 50 ms round-trip time. What is its highest throughput?”

Use this for “A segment with sequence number 1000 carries 500 bytes. What acknowledgment number does the receiver send?”

Use this for “Put the segments that open, use and close a TCP connection in order.”

Use this for “In what order does Dijkstra’s algorithm finalise the routers from S?”

Use this for “A router has 10.1.2.0/24, 10.1.0.0/16, 10.0.0.0/8 and a default route. Where does 10.1.9.9 go?”

Use this for “How many bytes are in flight on a 100 Mb/s path with a 20 ms round trip?”

Use this for “A frame takes 0.12 ms to send and the round trip is 20 ms. How busy is a stop-and-wait link?”

Use this for “Packets reach a router at 800 a second and it serves 1000 a second. Find the average delay and number queued.”

Use this for “A 4 MB file crosses a 10 Mb/s link, then a 2 Mb/s link. How long does the transfer take?”