Network Protocols and Services Flashcards
6 cards from real CCST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Network Protocols and Services flashcards as text
What is the purpose of NAT (Network Address Translation)?
Answer: Maps private internal IP addresses to a public IP address for internet access
NAT translates private RFC 1918 addresses used inside a network to a public IP address when communicating with the internet, conserving public address space.
Which file transfer protocol uses TCP port 21 for control and TCP port 20 for data transfer in active mode?
Answer: FTP
FTP (File Transfer Protocol) uses port 21 for the control connection and port 20 for the data connection in active mode.
A technician needs to transfer a router's IOS image using a lightweight protocol that requires no authentication and uses UDP. Which protocol should they use?
Answer: TFTP
TFTP (Trivial File Transfer Protocol) uses UDP port 69 and provides simple, unauthenticated file transfers, commonly used for IOS images and config files.
Which protocol synchronizes the clocks of networked devices and uses UDP port 123?
Answer: NTP
NTP (Network Time Protocol) uses UDP port 123 to synchronize device clocks across a network to a common time source.
What does the acronym VLAN stand for, and what is its primary purpose?
Answer: Virtual LAN — logically segments a physical network into separate broadcast domains
A VLAN (Virtual LAN) logically divides a physical switch into multiple isolated broadcast domains, improving security and traffic management.
Which protocol resolves IP addresses to MAC addresses on a local network segment?
Answer: ARP
ARP (Address Resolution Protocol) broadcasts a request on the local segment to discover the MAC address associated with a known IP address.