CGS 4285 (2) | UPDATED Questions with 100% Verified
Answers
Q1: Multiple users share a 10 Mbps link. Each user requires 10
Mbps when transmitting, but each user transmits for only 20%
of the time. When circuit switching is used, how many users
can be supported?
A: 1
Q2: Multiple users share a 10 Mbps link. Each user requires 10
Mbps when transmitting, but each user transmits for only 20%
of the time. Suppose packet switching is used. Assuming that
there are two users, what is the probability that the link cannot
support both users simultaneously?
A: 0.04
Q3: Consider two hosts, A and B, connected by a single link of rate
1 Mbps. Suppose that the two hosts are separated by 3,000
Km, and suppose the propagation speed along the link is
3x10^8 m/s. Host A is to send a packet of 1,000 bytes to Host
B. Calculate the transmission delay in seconds.
A: 0.008
Q4: Consider two hosts, A and B, connected by a single link of rate
1 Mbps. Suppose that the two hosts are separated by 3,000
Km, and suppose the propagation speed along the link is
3x10^8 m/s. Host A is to send a packet of 1,000 bytes to Host
B. Calculate the propagation delay in seconds.
A: 0.01
Q5: The transport layer provides logical communication between
A: processes
Q6: For a DNS server, how man sockets does it have to process
DNS requests from 10 clients
A: 1
Q7: List the advantages of UDP over TCP
A: No congestion control: UDP can blast away as fast as desired. No connection
establishment. Small header size. No connection state at sender, reciever.
, Q8: Given two bytes: 11011010 and 01100101, what is the internet (1's
complement) checksum of the two bytes?
A: 1011 1111
Q9: What are the possible errors that a reliable data transfer
protocol at the transport layer needs to deal with?
A: Packet losses. Transmission errors in data packets. Transmission errors in
acknowledgement packets.
Q10: Which protocol is used when an email User Agent is sending
an email?
A: Simple Mail Transfer Protocol (SMTP)
Q11: Which of the following DNS server does not belong to the
hierarchal DNS structure?
A: Local Name Server
Q12: When different DNS clients resolve the same domain name at
the same time they may receive different IP addresses?
A: True
Q13: Identify the rules used by BitTorrent peers to send file chunks.
A: Optimistically unchoke
Q14: For effecient video streaming, _____________ host multiple copies
of a video file on geographically distributed servers, so that an
end user can receive the video from a server close to it to
endure low delay and high throughput.
A: Content Delivery Networks
Q15: HTTP is a stateless, i.e., not remembering user statuses,
protocol.
A: True
Q16: Which of the following protocols is based on peer-to-peer
architecture?
A: Bittorrent
Q17: Which of the following services is not NOT provided by TCP?
A: Minimum throughput
Answers
Q1: Multiple users share a 10 Mbps link. Each user requires 10
Mbps when transmitting, but each user transmits for only 20%
of the time. When circuit switching is used, how many users
can be supported?
A: 1
Q2: Multiple users share a 10 Mbps link. Each user requires 10
Mbps when transmitting, but each user transmits for only 20%
of the time. Suppose packet switching is used. Assuming that
there are two users, what is the probability that the link cannot
support both users simultaneously?
A: 0.04
Q3: Consider two hosts, A and B, connected by a single link of rate
1 Mbps. Suppose that the two hosts are separated by 3,000
Km, and suppose the propagation speed along the link is
3x10^8 m/s. Host A is to send a packet of 1,000 bytes to Host
B. Calculate the transmission delay in seconds.
A: 0.008
Q4: Consider two hosts, A and B, connected by a single link of rate
1 Mbps. Suppose that the two hosts are separated by 3,000
Km, and suppose the propagation speed along the link is
3x10^8 m/s. Host A is to send a packet of 1,000 bytes to Host
B. Calculate the propagation delay in seconds.
A: 0.01
Q5: The transport layer provides logical communication between
A: processes
Q6: For a DNS server, how man sockets does it have to process
DNS requests from 10 clients
A: 1
Q7: List the advantages of UDP over TCP
A: No congestion control: UDP can blast away as fast as desired. No connection
establishment. Small header size. No connection state at sender, reciever.
, Q8: Given two bytes: 11011010 and 01100101, what is the internet (1's
complement) checksum of the two bytes?
A: 1011 1111
Q9: What are the possible errors that a reliable data transfer
protocol at the transport layer needs to deal with?
A: Packet losses. Transmission errors in data packets. Transmission errors in
acknowledgement packets.
Q10: Which protocol is used when an email User Agent is sending
an email?
A: Simple Mail Transfer Protocol (SMTP)
Q11: Which of the following DNS server does not belong to the
hierarchal DNS structure?
A: Local Name Server
Q12: When different DNS clients resolve the same domain name at
the same time they may receive different IP addresses?
A: True
Q13: Identify the rules used by BitTorrent peers to send file chunks.
A: Optimistically unchoke
Q14: For effecient video streaming, _____________ host multiple copies
of a video file on geographically distributed servers, so that an
end user can receive the video from a server close to it to
endure low delay and high throughput.
A: Content Delivery Networks
Q15: HTTP is a stateless, i.e., not remembering user statuses,
protocol.
A: True
Q16: Which of the following protocols is based on peer-to-peer
architecture?
A: Bittorrent
Q17: Which of the following services is not NOT provided by TCP?
A: Minimum throughput
