CCST Network Protocols and Services

Question 1

Which protocol automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to network clients?

Accepted Answer

DHCP

Answer

DHCP (Dynamic Host Configuration Protocol) dynamically assigns IP configuration parameters to network hosts from a central server.

Question 2

On which well-known UDP ports does DHCP operate for server and client communication?

Accepted Answer

Port 67 (server) and 68 (client)

Answer

DHCP servers listen on UDP port 67 and clients receive responses on UDP port 68.

Question 3

What is the primary function of DNS (Domain Name System)?

Accepted Answer

Translate domain names into IP addresses

Answer

DNS resolves human-readable domain names (e.g., www.cisco.com) into numerical IP addresses that routers use to forward packets.

Question 4

Which protocol provides secure, encrypted remote command-line access to network devices, replacing Telnet?

Accepted Answer

SSH

Answer

SSH (Secure Shell) encrypts the entire session including credentials, replacing the insecure plaintext Telnet protocol.

Question 5

HTTP and HTTPS use which well-known TCP ports respectively?

Accepted Answer

80 and 443

Answer

HTTP uses TCP port 80 for unencrypted web traffic, while HTTPS uses TCP port 443 for TLS/SSL-encrypted web traffic.

(CCST) Cisco Certified Support Technician Practice Test