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 3 of 6 –
Referring to the network depicted in Link Layer slide 6-68 from Chapter_6_V7.01.pdf, IP hosts are connected by four Ethernet switches, S1, S2, S3 and S4. Assume that ARP tables on all hosts are empty, the switch tables on all switches are also empty. Consider two events occur in the network one after another. Event 1: host B (connected by S1) sends an IP datagram to host H (connected by S3), and then Event 2: H sends an IP datagram back to A. Answer the following questions. Note SELECT ALL correct answers. [12pt]
Question 1 of 6
For Event 1 (B first sends an IP datagram to H), which device/element below creates an ARP request message for H’s MAC address?
A. B B. E C. S1 D. S4
Mark for Review What’s This? Question 2 of 6
Continuing from the above for Event 1, which device/element(s) below receive the ARP request identified above and process it?
2 Points. Point(s) deducted for incorrect answer: 0.5
2 Points. Point(s) deducted for incorrect answer: 0.5
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
Question 3 of 6
Continuing from the above for Event 1 as an ARP reply sent with H’s MAC address
2 Points. Point(s) deducted for incorrect answer: 0.5
resolved, which device/element(s) below receive this ARP reply message?
A. B B. E C. S1 D. S4
Mark for Review What’s This?
Question 4 of 6
Continuing for Event 1 as B sends the IP datagram encapsulated in an Ethernet frame for H, which device/element(s) below receive this Ethernet frame and process (at least) its header?
A. E B. H C. S3 D. S4
Mark for Review What’s This? Question 5 of 6
Now for Event 2 (H sends an IP datagram back to B), which device/element below create an ARP request (if any) for B’s MAC address?
A. No such a request created B. E
2 Points. Point(s) deducted for incorrect answer: 0.5
2 Points. Point(s) deducted for incorrect answer: 0.5
B. H C. S3 D. S4
Mark for Review What’s This?
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12/12/2020 NYU Classes : COMPUTER NETWORKING, Section A : Tests & Quizzes
Question 6 of 6
Continuing for Event 2 as H sends the IP datagram to B, which device/element(s) below
2 Points. Point(s) deducted for incorrect answer: 0.5
receive this IP datagram and process (at least) its header?
A. B B. E C. S1 D. S4
Mark for Review What’s This?
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