Session 4

What best describes network layer main objective?

• Provides service to service communication using port numbers

• Provides host-to-host communication using IP addresses for sender and receiver

• To manage physical connections between devices.
• To encrypt data for secure transmission.

What is the role of IP (Internet Protocol) in the network layer?

• To provide reliable, error-free transmission of data

• To assign MAC addresses to devices

• To route packets from the source to the destination

• To ensure encrypted communication over the internet

What is subnetting, and why is it used in networking?

• It divides a network into smaller sub-networks to improve efficiency and security

• It merges multiple IP addresses into a single address

• It encrypts data packets before transmission

• It assigns IP addresses to devices

Explain the difference between IPv4 and IPv6

• IPv4 uses 128-bit addresses, whereas IPv6 uses 32-bit addresses

• IPv4 supports more devices than IPv6

• IPv6 includes built-in security features, whereas IPv4 does not

• IPv6 has a smaller address space compared to IPv4

What is Network Address Translation (NAT) and why is it used in networking?

• A protocol used to assign IP addresses to devices.

• An algorithm used for routing packets to destination

• A technique used for mapping between private IPs and public IPs

• None of above

IPv4 is .... in size, formatted as ..... each of which is one byte, separated by ......

• 128 bits - 8 octets - colons

• 32 bytes - 4 octets - periods

• 128 bits - 16 octets -colons

• 32 bits - 4 octets - periods

What is the class of 192.168.3.65?

• Class A

• Class B

• Class C

What is the network address of 10.21.42.123/24 ?

• 10.21.0.0

• 10.21.40.0

• 10.21.42.0

• 10.21.32.0

If Youssef is establishing his new startup company and he still has few employees (almost 50 devices)
What IP class do you suggest he uses for his employees computers?

• Class A

• Class B

• Class C

What is number of hosts for a network with subnet mask 255.255.255.0?

• 254

• 256

• 62

• 64