CS代考 GY 6843 / CS-UY 4793 Final Exam

12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
COMPUTER NETWORKING, Section A    Tests & Quizzes
Tests & Quizzes
CS-GY 6843 / CS-UY 4793 Final Exam

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Part 2 of 6 –
Select ONE correct answer in each of the following multiple choice questions. [36pt]
Question 1 of 12
Suppose an application generates chunks of 60 bytes of data every second, and each chunk gets encapsulated in a TCP segment and then an IPv6 datagram. What percentage of each datagram will contain application data?
A. 40% B. 50% C. 60% D. 80%
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Question 2 of 12
In CSMA/CD, after the 3rd collision, what is the probability that the node chooses 2 in
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backoff from a random range of K?
A. 0.33 B. 0
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
Question 3 of 12
Suppose an IPv6 router wants to forward a v6 datagram to another IPv6 router, but they
are connected via intervening IPv4 routers using tunneling. Then
A. None of the above is true.
B. The sending IPv6 router creates an IPv4 datagram and puts it in the data field of an IPv6 datagram.
C. The sending IPv6 router creates an IPv4 packet and puts the v6 datagram as data payload for the IPv4 packet.
D. The sending IPv6 router creates one or more IPv6 fragments, which size is smaller than the maximum size of an IPv4 datagram.
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Question 4 of 12
When a TCP segment arrives to a host with IPv4 OS, in order to direct the segment to the
appropriate socket, the OS further checks
A. the destination port number.
B. the source IP address, the source port number. C. all the above.
D. the Upper – Layer Protocol field in IP header.
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Question 5 of 12
A host uses DHCP protocol in a four-step process to obtain an IP address, starting from host’s DHCP DISCOVERY broadcasted, then a DHCP server’s DHCP OFFER, DHCP REQUEST, to DHCP ACK. Which of the following message is a broadcast message?
A. DHCO OFFER
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
Question 6 of 12
When Ethernet switch transmits a frame in flooding, this frame has
A. None of the above is correct.
B. the switch’s MAC address as its source address.
C. the switch’s MAC address as its destination address. D. the broadcast address as its source address.
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Question 7 of 12
In CRC error detection scheme, which polynomial below is ALWAYS correctly presented at
both sender and receiver?
A. Error polynomial E(x).
B. Data message M(x).
C. Generator polynomial P(x). D. Frame check sequence R(x).
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Question 8 of 12
If the TTL field is 1 in an incoming IP datagram received by a router which is one hop away
B. All the above
C. DHCP DISCOVERY D. DHCP REQUEST
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from the destination host, what does the router do with the IP packet?
A. Drop it and generate a host-unreachable ICMP message.
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
Question 9 of 12
Suppose you walk into a classroom, power on your PC, connect it to a wireless LAN, and want to check a Web page. The very first application layer protocol and the associated transport layer protocol that your PC invoked are
A. None of the above B. DNS and UDP
C. HTTP and TCP
D. DHCP and UDP
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Question 10 of 12
______________ delay is the time packets spent in switching nodes checking packets’ bit-
level errors, examining their header, and determining where to direct them.
A. Queuing
B. Processing C. Transmission D. Propagation
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Question 11 of 12
The ICMP Ping program involves the following
3 Points. Point(s) deducted for incorrect answer: 3.0
B. Drop it and generate a time-exceeded ICMP message.
C. Forward it if the destination is only one hop away from the router. D. None of the above.
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ICMP messages:
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
Question 12 of 12
An ARP query packet is encapsulated in
A. none of the above packets.
B. a Link-layer frame sent to a specific adapter. C. a Link-layer broadcast frame.
D. An IP datagram.
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A. Redirect
B. Echo request/reply C. Time exceeded
D. Port unreachable
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
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