Computer Networks And Internet Protocol Week 11 Answers

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Nptel Computer Networks And Internet Protocol Week 11 Answers (Jan-Apr 2025)

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Here are your formatted MCQs:

1) Address Resolution Protocol (ARP) is primarily concerned with-

a) To resolve IP addresses to MAC addresses.
b) To resolve hostnames to IP addresses.
c) To resolve port numbers to IP addresses.
d) To resolve MAC addresses to IP addresses.

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2) Identify the WRONG statement in the following-

a) BOOTP is a legacy protocol used to assign IP addresses and other configuration information to devices during startup.
b) BOOTP evolved from DHCP to support dynamic IP addressing and reusable addresses.
c) Both DHCP and BOOTP serve the purpose of providing IP addresses and configurations to devices.
d) None of them.

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3) Which port number does DHCP use for client-server communication at layer 2?

a) TCP 80
b) UDP 67 & 68
c) UDP 50 & 51
d) UDP 23

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4) Which protocol is used to prevent bridge loops in an Ethernet network?

a) Point-To-Point Protocol (PPP)
b) Dynamic Host Configuration Protocol (DHCP)
c) Address Resolution Protocol (ARP)
d) Spanning Tree Protocol (STP)

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5) Which feature is/are concerned with trunk links in VLAN-based networks?

I. It can carry data from multiple VLANs over a single physical connection.
II. It allows VLANs to span across multiple switches, enabling seamless communication for devices in the same VLAN, even if they are connected to different switches.

a) Only (I)
b) Only (II)
c) Both (I) and (II)
d) Neither (I) nor (II)

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6) Which provides a solution to the hidden terminal problem in wireless LANs?

a) RTS/CTS mechanism
b) Backoff timers
c) Interframe Space (IFS)
d) None of these.

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7) Given a wireless network using CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance), where the transmission time of a data frame is 200 ms. The contention window backoff time (in the event of a collision) always follows an exponential backoff mechanism, with a random backoff time selected from a range of 0 to 10 slots. Each slot is 10 ms. A collision happens, and the backoff time for retransmission is selected randomly within the range of 0 to 10 slots. What is the total time spent (in ms) for the first retransmission if the backoff time is randomly selected to be 7 slots? (Ignore the time spent in the first transmission attempt)

a) 200 ms
b) 250 ms
c) 260 ms
d) 270 ms

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Computer Networks And Internet Protocol Week 11 Answers

8) In which layer does Spanning Tree Protocol (STP) work?

a) Layer 2
b) Layer 3
c) Layer 4
d) Layer 5

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9) The configuration of a DHCP server is as follows-

Network Address: 192.0.1.0/24
Reserved Addresses: 192.0.1.1 to 192.0.1.20 (for routers and servers)

How many addresses are available for clients?

a) 256
b) 255
c) 234
d) 231

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10) Match the following-