Network Protocols and Services Flashcards

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

Answer: DHCP

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

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

Answer: Port 67 (server) and 68 (client)

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

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

Answer: Translate domain names into IP addresses

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

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

Answer: SSH

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

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

Answer: 80 and 443

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

Which protocol is used by network management systems to monitor and manage network devices, and on which UDP port does it operate?

Answer: SNMP on port 161

SNMP (Simple Network Management Protocol) uses UDP port 161 to poll managed devices and UDP port 162 for trap notifications.