Network Services & Protocols Flashcards

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

Answer: Resolve IP addresses to MAC addresses on a local network

ARP resolves a known IPv4 address to the corresponding MAC (hardware) address needed for Layer 2 frame delivery on the same network segment.

Which well-known port number does HTTPS use by default?

Answer: 443

HTTPS (HTTP Secure) uses TCP port 443 by default, providing encrypted web communication using TLS/SSL over the standard HTTP protocol.

What does SNMP stand for, and what is its primary use?

Answer: Simple Network Management Protocol — used to monitor and manage network devices

SNMP (Simple Network Management Protocol) is used to collect information from and configure network devices such as routers, switches, and servers from a central management station.

Which first DHCP message does a client broadcast when it needs an IP address?

Answer: DHCPDISCOVER

The DHCP process begins with a DHCPDISCOVER broadcast sent by the client to locate available DHCP servers on the local network segment.

What is the purpose of a default gateway in network configuration?

Answer: It is the router IP address that hosts send traffic to when the destination is on a remote network

A default gateway is the IP address of the local router interface that hosts use to forward packets destined for networks outside their own subnet.

What does the TTL (Time to Live) field control in DNS?

Answer: How long a DNS record will be cached by resolvers before they must re-query

The DNS TTL value specifies in seconds how long a resolver or client can cache a DNS record before it must re-query the authoritative server for fresh data.

What is the well-known port used by Telnet?

Answer: 23

Telnet uses TCP port 23 to provide unencrypted remote command-line access to network devices; SSH (port 22) is the secure replacement.