KS4 - Focus session post QLA

• Computing
• Upper Secondary (Key Stage 4)
• GCSE

KS4 - Focus session post QLA

Describe the term "standard"

Standard

• Set of rules that are followed in industry
• Agreed way of doing things
• ensure compatibility

Explain how more users on a network can impact network performance

Answer

More users = less bandwidth available per user

Less bandwidth = worse network experience

• Longer waits / increased latency
• more collisions - higher error rate
• loss of data packets - retransmission needed (speed)

Tasks a Router Performs

Router

FUNCTION:

To connect two different networks together

TASKS PERFORMED:

• Send packets
• Receive packets
• Identify most efficient path to destination
• Assign IP addressed

MAC ADDRESS

IP ADDRESS

4 bytes

6 pairs of Hex values

Physical

Global

Fixed

Fixed or dynamic

0.11.3.255

Has 2 versions

Uses Colons

2B:33:D2:FF:10:A1

1034:A3FA:10FA:223D:5221:ABC3:3321:AAA3

Each value of an IP address is between ____ and ____

Explain role of the DNS when loading web pages in a browser [4]

DNS Steps

• Type URL into browser
• Pass URL to DNS to be looked up
• Check database of addresses for match
• Return associated IP address to browser
• to load relevant page
• If DNS does not have it in its database - pass to another DNS

Why is it important to encrypt data (like an online purchase)

Importance of encryption

• Ensure it cannot be read if intercepted
• Follow legislation (DPA/GDPR - secure personal data) 

RAM

ROM

All things Primary