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SDP9

Beschreibung

beka lox
CSSE150(1,2,3) 5stream IITU
Quiz von CSSE150(1,2,3) 5stream IITU, aktualisiert more than 1 year ago
CSSE150(1,2,3) 5stream IITU
Erstellt von CSSE150(1,2,3) 5stream IITU vor mehr als 6 Jahre
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Zusammenfassung der Ressource

Frage 1

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Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core.
Antworten
  • True
  • False

Frage 2

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With ADSL, each subscriber gets more downstream bandwidth than upstream bandwidth.
Antworten
  • True
  • False

Frage 3

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Twisted-pair cooper wire is no longer present in computer networks.
Antworten
  • True
  • False

Frage 4

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4. Two packets A and B are sent in that order through a connection-oriented communication network. They could arrive at the destination:
Antworten
  • a. in any order, after having traversed the same route.
  • b. only in the order A-B, after possibly having traversed different routes.
  • c. in any order, after possibly having traversed different routes.
  • d. only in the order A-B, after having traversed the same route.

Frage 5

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5. Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination:
Antworten
  • 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.

Frage 6

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6. The Internet received its name in the 1980s because:
Antworten
  • a. it was an interim (temporary) design of what it later became, but the name stuck.
  • b. it was meant to be a network internal to the United States Department of Defense.
  • c. it consisted of many interconnected networks.
  • d. it achieved international scope with the addition of the City University of London.

Frage 7

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DNS lookups often involve a combination of recursive and iterative queries.
Antworten
  • True
  • False

Frage 8

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The Date: header in the HTTP response message indicates when the object in the response was last modified.
Antworten
  • True
  • False

Frage 9

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Skype relay nodes are typically peers under the control of Skype users.
Antworten
  • True
  • False

Frage 10

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The process that sends messages into, and receives messages from, the network through a software interface is called a socket.
Antworten
  • True
  • False

Frage 11

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In a P2P File Distribution architecture, the server must sequentially send (upload) file copies.
Antworten
  • True
  • False

Frage 12

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12. SMTP is used to:
Antworten
  • 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.

Frage 13

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13. Suppose a DNS resource record has Type=MX. Then:
Antworten
  • a. Value is the hostname of the DNS server that is authoritative for Name.
  • 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.

Frage 14

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14. Local DNS name servers:
Antworten
  • a. cache resource records, but discard them after a period of time that is on the order of a few days.
  • b. cache resource records and never discard them.
  • c. obtain resource records from Web caches.
  • d. never cache resource records.

Frage 15

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Consider an HTTP Web server using persistent connections. Suppose the server spawns a separate process for each client that connects to the server. Then each of these spawned processes will have different server port numbers.
Antworten
  • True
  • False

Frage 16

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The size of the TCP RcvWindow never changes throughout the duration of the connection.
Antworten
  • True
  • False

Frage 17

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17. When a TCP segment arrives to a host, the socket to which the segment is directed depends on
Antworten
  • a. the source IP address of the datagram that encapsulated the segment.
  • b. the destination port number.
  • c. the source port number.
  • d. all of the above.

Frage 18

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18. UDP has which of the following characteristics:
Antworten
  • a. regulated send rate.
  • b. connection state at the server.
  • c. three-way hand shake for connection establishment.
  • d. none of the above.

Frage 19

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19. When a UDP segment arrives to a host, in order to direct the segment to the appropriate socket, the OS uses:
Antworten
  • a. the source port number.
  • b. the source IP address.
  • c. the destination port number.
  • d. all of the above.

Frage 20

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20. Suppose a client sends an HTTP request message with the If-modified-since: header. Suppose the object in a server has not changed since the last time a client retrieved the object. Then the server will send a response message with the status code:
Antworten
  • a. 404 Not Found.
  • b. 200 OK.
  • c. 304 Not Modified.
  • d. none of the above.

Frage 21

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21. Streams are not needed in which of the following programs:
Antworten
  • a. TCPserver.
  • b. UDPserver.
  • c. TCPclient.
  • d. UDPclient.

Frage 22

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22. Consider the minimum time for P2P file distribution, as discussed in Section 2.6. Suppose the upload rate of the server is10 Mbps, the upload rates of all peers is 1 Mbps, and the download rates of all peers is 10 Mbps. Further suppose that there are 100 peers and the file is 100 million bits. The minimum distribution time is
Antworten
  • a. approximately 100 seconds.
  • b. approximately 10 seconds.
  • c. approximately 1 second.
  • d. approximately 1000 seconds.

Frage 23

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For BitTorrent, which of the following is true:
Antworten
  • a. 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.
  • 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. Among the chunks that a peer does not have, the peer will request chunks that appear to be relatively rare in the torrent.
  • d. All of the above.

Frage 24

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24. Consider the latency model for dynamic congestion windows. Which of the following components contribute to latency?
Antworten
  • a. the sum of all the stalled times.
  • b. round trip time, RTT.
  • c. the transmission time of the object, O/R.
  • d. all of the above.

Frage 25

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25. TCP applies fast retransmit to a segment when:
Antworten
  • 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.

Frage 26

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26. Nmap is often used to:
Antworten
  • a. do port scans over a range of ports at a target host.
  • b. measure throughput between hosts.
  • c. measure round-trip times between hosts.
  • d. decipher encrypted traffic.

Frage 27

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27. With SYN cookies, when a server receives a SYN segment, it returns a SYNACK with:
Antworten
  • a. an initial sequence number that is a hash of the IP addresses and port numbers in the SYN segment (as well as of other things).
  • b. initial sequence number 1.
  • c. a randomly chosen initial sequence number.
  • d. none of the above.

Frage 28

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Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination.
Antworten
  • True
  • False

Frage 29

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The primary role of a router is to forward datagrams from input links to output links.
Antworten
  • True
  • False

Frage 30

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Forwarding involves transferring a packet from the router’s input link to the appropriate output link.
Antworten
  • True
  • False

Frage 31

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All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields).
Antworten
  • True
  • False

Frage 32

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CRC error detection, as used in Ethernet, is always able to detect whether there is an error in a frame.
Antworten
  • True
  • False

Frage 33

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The even parity bit scheme can correct single bit errors.
Antworten
  • True
  • False

Frage 34

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With CDMA, each sender uses the same code, cm, m=1,...,M.
Antworten
  • True
  • False

Frage 35

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Each LAN adapter has a unique LAN address.
Antworten
  • True
  • False

Frage 36

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41. A channel partitioning protocol has which of the following characteristics forwarding table is:
Antworten
  • a. it does not generate collisions.
  • b. all transmitting nodes get the same amount of bandwidth.
  • there is no master node.
  • d. all of the above.

Frage 37

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42. In slotted ALOHA with N active nodes, the probability that no node transmits in a given slot is
Antworten
  • a. (1-p)N
  • b. (1-p)N
  • c. pN
  • d. 1-p

Frage 38

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43. An ARP query packet is encapsulated in
Antworten
  • a. an IP datagram.
  • a link-layer frame addressed to a specific adapter.
  • a link-layer broadcast frame.
  • none of the above.

Frage 39

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Ethernet provides which of the following services to the network layer
Antworten
  • a. error detection.
  • flow control.
  • reliable data transfer.
  • all of the above.

Frage 40

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45. For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter
Antworten
  • a. it discards the frame without sending an error message to the network layer.
  • it discards the frame and sends an error message to the network layer.
  • it sends a NACK (not acknowledged frame) to the sending host.
  • it delivers the frame to the network layer, and lets the network layer decide what to do.

Frage 41

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A typical "infrastructure network" wireless network includes base stations.
Antworten
  • True
  • False

Frage 42

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In CDMA, the chipping rate is typically the same as the original data rate.
Antworten
  • True
  • False

Frage 43

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The 11 channels in the 802.11 are non-overlapping.
Antworten
  • True
  • False

Frage 44

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If you enter an Internet café and more than one AP is present, then the packets your host
Antworten
  • True
  • False

Frage 45

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During the 802.11 association handshake protocol, the wireless host gets assigned an IP address.
Antworten
  • True
  • False

Frage 46

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51. In CDMA, let Ym be the received value in the mth mini-slot for some slot i. Let cm, m=1,...,M, be the sender's M code values. To determine the bit value the sender sent, the receiver:
Antworten
  • a. multiples Ym with the sum of the M code values.
  • b. multiplies each Ym with the corresponding cm, sums the resulting values and divides by M.
  • simply declares Ym as the sent value.
  • d. none of the above.

Frage 47

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52. A beacon frame sent by an AP includes
Antworten
  • a. the AP's SSID.
  • b. the AP's MAC address.
  • c. both the AP's MAC address and SSID.
  • d. none of the above.

Frage 48

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53. The 802.11 protocol does not implement collision detection because (Click all that apply)
Antworten
  • a. collision detection was found to be useless in wired Ethernet.
  • b. the adapter would still not be able to detect all collisions due to hidden terminals. c. it is costly to build wireless hardware that detects collisions.
  • c. it is costly to build wireless hardware that detects collisions.
  • d. all of the above.

Frage 49

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54. Packets sent by two stations in 802.11 can collide because
Antworten
  • 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.

Frage 50

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An 802.11 frame includes:
Antworten
  • a. an acknowledgement field.
  • b. a sequence number field.
  • c. four address fields.
  • d. all of the above.

Frage 51

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In IP spoofing, the attacker interchanges the source and destination addresses in the sender's IP datagram.
Antworten
  • True
  • False

Frage 52

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Nonce's are often used to combat the playback attack.
Antworten
  • True
  • False

Frage 53

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65. Filtering in a firewall can be based on:
Antworten
  • a. source and destination IP addresses
  • b. TCP ACK bits
  • c. source and destination port numbers
  • d. all of the above
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