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Created by: bimbus

Suppose Host A sends 3 TCP segments back to back to Host B over a TCPconnection. The sequence numbers of the 1st, 2nd, and 3rd segments are 1000,1500, and 2500 respectively. When the 1st segment arrives at B, in the ACKthat B sends to A, what will be the ACK number?
- 1000
- 1001
- 1501
- 1500
Suppose Host A sends 3 TCP segments back to back to Host B over a TCPconnection. The sequence numbers of the 1st, 2nd, and 3rd segments are 1000,1500, and 2500 respectively. How much data is in the 1st segment?
- 1000 bytes
- 125 bytes
- 1500 bytes
- 500 bytes
Which of the following is NOT a reason to choose TCP for file transfer?
- File transfer is not sensitive to round trip delay
- File transfer needs to be secure
- File transfer requires reliable delivery
- File transfer is an elastic application
Which layers in the Internet protocol stack does a router process?
- Physical, link, network
- Physical, link, network, transport
- Physical, link
- Physical, link, network, transport, application
What information is used by a process to identify a process running on another host?
- Host Ethernet Address and Process ID
- Host IP Address and Socket Port Number
- Host IP Address and Process ID
- Host Ethernet Address and Socket Port Number
For a browser with no parallel TCP connections, getting a web page with 6 images with nonpersistent HTTP takes
- 12 round trips
- 7 round trips
- 8 round trips
- 14 round trips
For a browser with no existing TCP connections, getting a web page with 6 images with persistent HTTP without pipelining takes
- 14 round trips
- 7 round trips
- 12 round trips
- 8 round trips
TCP uses which of the following fields in the segment header to determine the socket to pass the received data to?
- Source port number, destination port number
- Source IP address, source port number
- Destination IP address, destination port number
- Source IP address, source port number, destination IP address, destination port number
How many sockets does a UDP server supporting 9 different clients simultaneously need?
- 18
- 10
- 9
- 1
Which of the following is NOT true of client server architecture?
- Client may have dynamic IP address
- Clients communicate directly with each other
- Client may be intermittently connected
- Client initiates the contact with the server
Which of the following delays vary depending on the network congestion?
- Transmission delay
- Propagation delay
- Nodal processing delay
- Queuing delay
Which of the following delays vary depending on the network congestion?
- Transmission delay
- Propagation delay
- Nodal processing delay
- Queuing delay
How many sockets does a TCP server supporting 9 different clients simultaneously need?
- 18
- 9
- 1
- 10
Suppose two hosts, A and B, are separated by 5,000 kilometers and are connected by a direct link of R = 1 Mbps. Suppose the propagation speed over the link is 2.5 ⇥ 105 kilometers/sec. What is the maximum number of bits that will be in the link at any time?
- 40000
- 80000
- 20000
- 10000
Data transfer between neighboring network elements is the responsibility of
- network layer
- transport layer
- application layer
- link layer
Process to process data transfer is the responsibility of
- application layer
- transport layer
- network layer
- link layer
Which is NOT true about packet switching with store-and-forward transmission?
- Each packet is transmitted at full link capacity
- Packet incurs transmission delay at each hop
- Hosts break application layer messages into packets
- Router begins forwarding as soon as it gets packet's header
Which of the following is NOT a reason for an application developer to choose UDP over TCP?
- No congestion control
- More secure
- No connection establishment
- Small header size
Which of the following is NOT a service provided by DNS?
- Dynamic IP address allocation
- Mail server aliasing
- Hostname to IP address translation
- Host aliasing
Which of the following is NOT a part of Uniform Resource Locator (URL)?
- Server host name and port number
- Object path name
- Object size
- Application protocol
Which type of DNS resource record contains the IP address of a hostname?
- CNAME
- A
- NS
- MX
Which of the following is NOT an end system?
- Server
- Laptop
- Router
- Smartphone
Suppose Host A sends 3 TCP segments back to back to Host B over a TCP connection. The sequence numbers of the 1st, 2nd, and 3rd segments are 1000, 1500, and 2500 respectively. Suppose the 1st segment arrives, 2nd segment is lost, and then the 3rd segment arrives at B. When the 3rd segment arrives at B, in the ACK that B sends to A, what will be the ACK number?
- 1500
- 1000
- 1001
- 2500
UDP uses which of the following fields in the segment header to determine the socket to pass the received data to?
- Source IP address, source port number
- Source port number, destination port number
- Source IP address, source port number, destination IP address, destination port number
- Destination IP address, destination port number
Which of the following services are provided by both TCP and UDP?
- Congestion control
- Reliable transport
- Flow control
- Inter-process communication

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