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  • Networking Devices MCQs & PYQs with Explanations | Suraku Academy

Q: 1 Devices in Data Link Layer are _____________.

  1. Router & Hub

  2. Switch & Bridge

  3. Repeater & Transceiver

  4. Modem & Bridge

[ Option B ]

In computer networking, each OSI layer is associated with specific devices based on the type of work it performs.
Devices working at Data Link Layer must understand MAC addresses and operate on frames.
Switch:

  • Uses MAC addresses to forward data.
  • Sends data only to the intended device (port).
  • Works efficiently in LANs.

Bridge:

  • Connects two LAN segments.
  • Filters traffic using MAC addresses.
  • Reduces unnecessary network traffic.
DEVICELAYERFUNCTION
ModemPhysical LayerConverts digital signals into analog and vice versa.
RepeaterPhysical LayerRegenerates weak signals to extend transmission distance.
HubPhysical LayerSends incoming data to all connected devices without filtering.
SwitchData Link LayerForwards frames to the correct port using MAC addresses.
BridgeData Link LayerConnects LAN segments and filters traffic using MAC addresses.
RouterNetwork LayerRoutes packets between networks using IP addresses.

Q: 2 The size of MAC address (in bits) is—

  1. 24

  2. 48

  3. 36

  4. 42

[ Option B ]

A MAC (Media Access Control) address is a hardware identifier assigned to each Network Interface Card (NIC). It works at the Data Link Layer of the OSI model and ensures that each device on a local network can be uniquely identified.

  • MAC addresses are used to send data between devices on the same network segment.
  • They are permanent and unique, unlike IP addresses which can change.
  • A MAC address is 48 bits long.
  • It is typically written in hexadecimal notation as six groups of two digits as 00:1B:2C:3E:4B:BB.
  • The first 24 bits represent the manufacturer OUI (Organizationally Unique Identifier), and the last 24 bits represent the unique Device ID.

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