Basic CS-Networks [TCS Placement]: Sample Questions 57 - 58 of 133

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Question 57

Networks
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Describe in Detail

Essay▾

What is the difference between routable and non-routable protocols?

Explanation

Table of Difference between Routable and Non-Routable Protocols
Routable protocolsNon-routable protocols
Can work with a router and can be used to build large networks.Designed to work on small, local networks and cannot be used with a router.
Communications protocol that contains a network address as well as a device address.Communications protocol that contains only a device address and not a network address.
Allows packets to be forwarded from one network to another.Does not incorporate an addressing scheme for sending data from one network to another.
Examples are TCP/IP, IPX, AppleTalk, SNA, XNS and DECnet.Examples are NetBIOS and DEC՚s LAT protocols.
Used in both LAN and WANUsed only in LAN

Question 58

Networks
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Describe in Detail

Essay▾

What is logical link control?

Explanation

  • Logical link control is one of two sub layers of the data link layer of OSI reference model, as defined by the IEEE standard.
  • Responsible for maintaining the link between computers when sending data across the physical network connection.
  • Concerned with managing traffic (flow and error control) over the physical medium.
  • Includes the following network protocol features:
    • Multipoint network operation
    • Unified network media exchange
    • Identifies a line protocol, such as SDLC, NetBIOS, or NetWare
    • Flow control
    • Line protocol identification, like Synchronous Data Link Control (SDLC)
    • Frame sequence number assignment
    • Acknowledgement tracking
  • LLC is now only used for its multiplexing feature with Transport Layer protocols, like TCP or other application layer protocols are used for source and destination network flow management.
  • A non-IEEE protocol may be distributed between the LLC and Media Access Control (MAC) layers, like Cisco՚s High-Level Data Link Control (HDLC) .
Given the Image is Define the Logical Link Control (LLC)

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