Sdp9 From The Photos
.
- 1.
- Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination:
- A.
In any order, after possibly having traversed different routes.
- B.
In the order A-B, after having traversed the same route.
- C.
In any order, after having traversed the same route.
- D.
In the order A-B, after possibly having traversed different routes
- 2.
- The Internet received its name in the 1980s because:
- A.
It consisted of many interconnected networks.
- B.
It was an interim (temporary) design of what it later became, but the name stuck.
- C.
It was meant to be a network internal to the United States Department of Defense.
- D.
It achieved international scope with the addition of the City University of London.
- 3.
- All store-and-forward networks are:
- A.
Packet or message switched networks.
- B.
Broadcast networks
- C.
Connection-based networks
- D.
Connectionless networks
- 4.The Date: header in the HTTP response message indicates when the object in the response was last modified.
- A.
True
- B.
False
- 5.The process that sends messages into, and receives messages from, the network through a software interface is called a socket
- A.
True
- B.
False
- 6.
- The transfer of an html file from one host to another is:
- A.
Loss-tolerant and time sensitive
- B.
Loss-intolerant and time sensitive
- C.
Loss-intolerant and time insensitive
- D.
None of the above
- 7.
- SMTP is used to
- A.
To transfer messages from one mail server to another
- B.
To transfer messages from mail server to a user agent
- C.
To define the format of message headers
- D.
All of the above
- 8.DNS resource record has Type\=MX
- A.
Value is the hostname of the DNS server that is authoritative for Name.
- B.
Value is the IP address of the mail server that has the alias hostname Name.
- C.
Value is the hostname of the mail server that has the alias hostname Name.
- D.
None of the above
- 9.
- When a UDP segment arrives to a host, in order to direct the segment to the appropriate socket, the OS uses
- A.
The destination port number
- B.
The source port number
- C.
The source IP address
- D.
All of the above
- 10.
- The stop-and-wait protocol is highly inefficient when there is a
- A.
Large distance between source and destination and the transmission rate is high
- B.
Large distance between source and destination and the transmission rate is low
- C.
Short distance between source and destination and the transmission rate is high
- D.
Short distance between source and destination and the transmission rate is low
- 11.Pipelining requires which of the following
- A.
All of the above
- B.
Transmitting many packets before receiving acknowledgements
- C.
Unique sequence numbers for each in-transit packet
- D.
Sender-side buffering of unacknowledged packets
- 12.
- Suppose a client sends an HTTP request message with the If-modified-since: header. Suppose the object in a server has not 1changed since the last time a client retrieved the object. Then the server will send a response message with the status code
- A.
404 Not Found
- B.
200 OK
- C.
304 Not Modified
- D.
None of the above
- 13.
- Streams are not needed in which of the following programs:
- A.
UDPserver
- B.
TCPserver
- C.
UDPclient
- D.
TCPclient
- 14.For BitTorrent, which of the following is true:
- A.
Among the chunks that a peer does not have, the peer will request chunks that appear to be relatively rare in the torrent.
- B.
At a given instant of time, a peer A may upload to a peer B, even if peer B is not sending anything to A.
- C.
Although a peer may have 50 concurrent TCP connections with other peers, at any given instant of time it sends data to less than 10 other peers.
- D.
All of the above.
- 15.TCP applies fast retransmit to a segment when
- A.
It estimates unusually large RTTs
- B.
It receives three ACKs for an earlier segment
- C.
The segment's timer expires
- D.
none of the above
- 16.Nmap is often used to:
- A.
Measure throughput between hosts
- B.
Measure round-trip times between hosts.
- C.
Decipher encrypted traffic
- D.
Do port scans over a range of ports at a target host.
- 17.For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter
- A.
It discards the frame without sending an error message to the network layer
- B.
It sends a NACK (not acknowledged frame) to the sending host
- C.
It delivers the frame to the network layer, and lets the network layer decide what to do
- D.
It discards the frame and sends an error message to the network layer
- 18.A beacon frame sent by an AP includes:
- A.
Both the AP's MAC address and SSID.
- B.
The AP's SSID.
- C.
The AP's MAC address.
- D.
None of the above
- 19.The 802.11 protocol does not implement collision detection because
- A.
The adapter would still not be able to detect all collisions due to hidden terminals.
- B.
It is costly to build wireless hardware that detects collisions.
- C.
Collision detection was found to be useless in wired Ethernet.
- D.
All of the above
- 20.Packets sent by two stations in 802.11 can collide because
- A.
At a given time, the random backoff values of the two stations are the same
- B.
The packets are sent to different Aps but on the same channel
- C.
The two stations could be hidden from each other
- D.
All of the above
- 21.An 802 11 frame includes
- A.
Four address fields.
- B.
A sequence number field.
- C.
An acknowledgement field.
- D.
All of the above
- 22.Which of the following statements best describes the purpose of the SNMP protocol
- A.
The SNMP protocol is a tool for gathering data about network conditions and executing remote actions at remote managed devices
- B.
The SNMP protocol specified the action …
- C.
The SNMP protocol is used by the network …
- 23.What is the purpose of the SNMP SetRequest message?
- A.
To allow a managing entity to query the value of a set of MIB object values in a managed device
- B.
To allow a managing entity to set the values of one or more MIB objects in a managed device
- C.
To allow a managed device to request and receive a set of initial values for MIB objects in the managed device.
- 24.What is the purpose of a presentation service?
- A.
To display data in a format specified by a user.
- B.
None of the above
- C.
To allow a client to inform a server that it (the client) is present and ready to receive dat
- D.
To encode, transmit, and translate data from one machine-specific format to another
- 25.How we call the link-layer packets ?
- A.
Frames
- B.
Datagrams
- C.
Packets
- D.
Segment
- E.
Message
Questions: 12 | Attempts: 27827 | Last updated: Mar 22, 2022
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