Computer Networks - Network Layer Quiz
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Questions and Answers

What is the first host address in the network 210.20.77.0?

  • 210.20.77.1 (correct)
  • 210.20.77.2
  • 210.20.77.0
  • 210.20.77.254
  • How many usable host addresses are available in a Class C network with 256 addresses?

  • 252
  • 254 (correct)
  • 255
  • 256
  • In subnetting a Class C network, if 5 bits are used for subnet addressing, how many subnets can be created?

  • 64
  • 32 (correct)
  • 16
  • 128
  • What is reserved for the broadcast address in the network 210.20.77.0?

    <p>210.20.77.255</p> Signup and view all the answers

    What is the default subnet mask for a Class C address?

    <p>255.255.255.0</p> Signup and view all the answers

    When calculating the subnet address using the binary method, what operation is performed between the IP address and the subnet mask?

    <p>Bit-wise AND</p> Signup and view all the answers

    In the range of available addresses for the network 210.20.77.0, what is the last usable host address?

    <p>210.20.77.254</p> Signup and view all the answers

    Which bit-wise operation results in a '0' for both inputs when calculating subnet addresses?

    <p>0 AND 0</p> Signup and view all the answers

    What is the default subnet mask for Class B IP addresses?

    <p>255.255.0.0</p> Signup and view all the answers

    In a Class C address with a subnet mask of 255.255.255.0, how many bits are used for the host portion?

    <p>8 bits</p> Signup and view all the answers

    Which of the following represents a Class A address in the default addressing scheme?

    <p>45.67.89.90</p> Signup and view all the answers

    What does the prefix '/24' indicate in the IP address 192.168.10.2/24?

    <p>The first 24 bits are for the network</p> Signup and view all the answers

    What is the range of IP addresses classified as Class C?

    <p>192-223</p> Signup and view all the answers

    How many networks are available in Class A?

    <p>128</p> Signup and view all the answers

    Which Class IP address utilizes a default subnet mask of 255.255.255.0?

    <p>Class C</p> Signup and view all the answers

    What is the primary criterion used by RIP to determine the best path between networks?

    <p>Hop count</p> Signup and view all the answers

    What is the total number of host IDs available in a Class B network with a /16 prefix?

    <p>65,536</p> Signup and view all the answers

    What does a distance value of 0 indicate in routing configurations?

    <p>The route is local and preferred</p> Signup and view all the answers

    What is the default distance for routes in RIP?

    <p>120</p> Signup and view all the answers

    How frequently do routers using RIP exchange their routing information by default?

    <p>30 seconds</p> Signup and view all the answers

    Which protocol is NOT classified as a dynamic routing protocol?

    <p>Static Route</p> Signup and view all the answers

    What happens if no update is received by a router for 180 seconds in RIP?

    <p>The router marks the neighboring router as out of service</p> Signup and view all the answers

    Which of the following routing protocols is classified as an external protocol?

    <p>BGP</p> Signup and view all the answers

    In static routing, how can multiple routes be prioritized?

    <p>By adding distance values to each route</p> Signup and view all the answers

    How many usable hosts are there per subnet in a /29 subnet mask?

    <p>6</p> Signup and view all the answers

    What is the first subnet address for the IP 211.215.9.115/29?

    <p>211.215.9.112</p> Signup and view all the answers

    What is the broadcast address for the first subnet of the IP address 211.215.9.115/29?

    <p>211.215.9.119</p> Signup and view all the answers

    What does the term 'subnet bits' indicate in the context of subnetting?

    <p>Bits used to create additional networks</p> Signup and view all the answers

    How many bits are typically added for 3 required subnets?

    <p>2</p> Signup and view all the answers

    Which type of routing uses protocols that adjust automatically for topology changes?

    <p>Dynamic routing</p> Signup and view all the answers

    What does a routing table indicate in a router?

    <p>Different networks and the best route to them</p> Signup and view all the answers

    What is the primary function of a static route in networking?

    <p>To manually configure routes for unidirectional communication</p> Signup and view all the answers

    Study Notes

    Computer Networks - Network Layer (Continued)

    • The lecture covers the Network Layer, focusing on addressing, subnetting, masks, and routing.
    • The Network Layer is part of the TCP/IP model.
    • A 32-bit binary address is divided into four 8-bit sections (octets).
    • Addresses are often expressed in dotted decimal notation (e.g., 192.168.10.44).
    • Each class of IP address has a default subnet mask.
    • Class A uses /8, Class B uses /16, and Class C uses /24.
    • Subnet masks are represented by dotted decimal format (e.g., 255.0.0.0).
    • Knowing the number of bits assigned to the network and host is crucial.
    • The number of network bits and their positions come after the IP address in the "slash" notation (e.g., /24).
    • The first and last host addresses are reserved for network and broadcast addresses.
    • This leaves 254 usable host addresses for a Class C address.
    • Subnetting divides a network into smaller subnets.
    • Subnetting is done by taking bits from the host portion to create subnet portions, leaving fewer bits for the actual host portion.
    • Subnet masks define how network and host bits are divided.
    • To calculate a subnet address, perform a bitwise AND operation between the IP address and the subnet mask.
    • A routing table helps routers identify appropriate network destinations.
    • Routers use destination addresses and routing tables to determine the best path for data packets.
    • Static routing is manually configured.
    • Dynamic routing (like RIP) involves routers updating their routing tables dynamically.
    • RIP (Routing Information Protocol) protocol is distance-vector:
      • It uses hop count as a routing metric to determine the best path.
      • Routers send updates every 30 seconds.
      • The hop count values max out at 15, as a route with a hop count of 16 is considered unreachable,
      • RIP uses port 520.
    • Routers use these tables to decide best paths to forward packets.

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    Computer Networks Lecture 7 PDF

    Description

    This quiz tests your knowledge on the Network Layer, focusing on key topics such as IP addressing, subnetting, and routing. You'll explore the intricacies of 32-bit binary addresses, subnet masks, and the various classes of IP addresses. Prepare to demonstrate your understanding of how these concepts are applied within the TCP/IP model.

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