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Which of the ISO/OSI model layers provides for routing
packets between nodes?
A. Data link
B. Network
C. Transport
D. Session
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Answer: B
The network layer switches and routes information (network
layer header). Node-to-node data link services are extended
across a network by this layer. The network layer provides
service for routing packets (units of information at the
network layer) between nodes connected through an arbitrary
network. The data link layer transmits information as
groups-of-bits (logical units called a frame) to adjacent
computer systems (node-to-node). The bits in a frame are
divided into an address field (media access control MAC 48
bit hardware address), control field, data field and error
control field. The transport layer, provides end-to-end data
integrity. To ensure reliable delivery, the transport layer
builds on the error control mechanisms provided by lower
layers. If lower layers do not do an adequate job, the
transport layer is the last chance for error recovery. The
session layer provides the control structure for
communications between applications. It establishes, manages
and terminates connections (sessions) between cooperating
applications and performs access security checking.
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