A data communication network consists of five key components: message, sender, receiver, transmission medium, and protocols. Performance is assessed through transit and response times, impacted by factors such as the number of users and type of medium, with reliability and security being crucial aspects. Network efficiency is evaluated using metrics like throughput and delay, alongside measures to protect data from unauthorized access and damage.

1. Components of Data Communication Network
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Five components are there:
 Message
 Sender
 Receiver
 Transmission Medium
 Protocols

2. Contd..
2

3. Data Representation
●Text
●Images
●Numbers
●Audio
●Video
Data Flow
●Simplex
●Half-duplex
●Full-duplex
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4. 4
➢ Performance : include measurement of transit time
& response time.
➢ Transit time is the amount of time required for a
message to travel from one
device to another.
➢ Response time is the elapsed time between an inquiry
& response.

5. 5
➢ Performance of a n/w depends on :
- no. of users
- type of transmission medium
-capabilities of the connected h/w
- efficiency of the s/w
➢ Performance evaluated by two networking
metrics: throughput & delay.
➢ Reliability: measured by the frequency of failure,
the time it takes a link to recover from a failure, &
the n/w’s robustness in a catastrophe.
➢Security: N/w security issues include protecting
data from unauthorized access, protecting data
from damage & development, & implementing
policies and procedures.