Question

Consider which layer of the OSI-model is the most appropriate for the
following functions and devices.
(a) Routing:
(b) SSH-connection for remote use:
(c) Ethernet-media repeater:
(d) Ethernet-switch:
(e) SNMP-based network management agent running in Ethernet switch:
(f) Error Detection:
(g) Fiber cable:

Answer 1

(a) Routing:
  
   Network Layer is responsible for determining how packets are routed from source to destination.

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(b) SSH-connection for remote use:
  
   Secure Shell(SSH) Protocol is used for secure network communication.
  
   Transport Layer is responsible for Server Authentication.
  
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(c) Ethernet-media repeater:
  
   Main role of repeater is to regenerate weak signals into strong signals.
  
   Repeater is an Hardware device resides at Physical Layer.
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(d) Ethernet-switch:

   With in a Network, Switch connects more than one device wherein multiple data cables are plugged into switch for communication.

   Ethernet-switch exists in Data Link Layer  
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(e) SNMP-based network management agent running in Ethernet switch:

   SNMP stands for Simple Network Management Protocol. It is an Application Level Protocol.
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(f) Error Detection:
  
   With in the Data Link Layer, data added to each frame will be checked at the destination end for valid/invalid values.
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(g) Fiber cable:
  
   Fiber Cable exists in Physical Layer for sending and receiving signals through Network Interface Card (NIC).
  
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