Computer Networks 2024-25
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A message of size 10,000 bits (not bytes) is sent from a source node A to a destination node B passing through two routers R1 and R2. All three links on the path have a delay of 20 ms. Node A has a transmission rate of 100 bits/sec, R1 and R2 have a transmission rate of 1000 bits/sec.
Find the total sum (in seconds) of transmission and propagation delays in transmitting the file from A to B when message is broken into 10 packets each of size 1000 bits. Answer up to 2 decimal places in units of seconds.
Note: Just write the decimal number. Do NOT mention the unit.
A user starts browsing a webpage hosted at a remote server. The browser opens a single TCP connection to fetch the entire webpage from the server. The webpage consists of a top-level index page with multiple embedded image objects. Assume that all caches (e.g., DNS cache, browser cache) are all initially empty. The following packets leave the user's computer in some order.
(i) HTTP GET request for the index page(ii) DNS request to resolve the web server's name to its IP address(iii) HTTP GET request for an image object(iv) TCP SYN to open a connection to the web server
Which one of the following is the CORRECT chronological order (earliest in time to latest) of the packets leaving the computer ?
Choose the best matching between group 1 and group 2
Time spent transmitting packets bits into the link.
Suppose a packet is L = 1500 bytes long, and link transmits at R = 1 Gbps. What is the transmission delay for this packet?
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