CIW Internet Protocols & Network Foundations

Question 1

At which layer of the OSI model does the IP protocol operate?

Accepted Answer

Network

Answer

IP operates at Layer 3 (Network layer), responsible for logical addressing and routing packets between networks.

Question 2

Which port does HTTP use by default?

Accepted Answer

80

Answer

HTTP uses port 80 by default for unencrypted web traffic, while HTTPS uses port 443.

Question 3

What is the primary difference between TCP and UDP?

Accepted Answer

TCP provides guaranteed, connection-oriented delivery while UDP does not

Answer

TCP is connection-oriented and guarantees reliable, ordered delivery through acknowledgments; UDP is connectionless and offers no delivery guarantee.

Question 4

Which protocol is responsible for automatically assigning IP addresses to devices on a network?

Accepted Answer

DHCP

Answer

DHCP (Dynamic Host Configuration Protocol) automatically leases IP addresses, subnet masks, gateways, and DNS server addresses to network clients.

Question 5

What is the purpose of the ARP (Address Resolution Protocol)?

Accepted Answer

Maps IP addresses to MAC addresses

Answer

ARP resolves a known IP address to its corresponding MAC (hardware) address on a local network segment.

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