CCST Network Services & Protocols 1 — Questions and Answers
Question 1: Which protocol is used to automatically assign IP addresses, subnet masks, default gateways, and DNS server addresses to network hosts?
- ARP
- DHCP (Correct answer)
- SNMP
- ICMP
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) automatically provides IP configuration parameters to network clients, eliminating the need for manual configuration.
Question 2: What well-known UDP port does a DHCP server use to send responses to clients?
- 67 (Correct answer)
- 68
- 53
- 69
Correct answer: 67
DHCP servers listen on UDP port 67 and send responses to clients; clients listen on UDP port 68.
Question 3: Which DNS record type maps a fully qualified domain name (FQDN) to an IPv4 address?
- AAAA
- MX
- A (Correct answer)
- CNAME
Correct answer: A
An A (Address) record maps a hostname to a 32-bit IPv4 address, while AAAA records are used for IPv6 addresses.
Question 4: What is the purpose of NAT (Network Address Translation)?
- Encrypt data transmitted over the network
- Translate private IP addresses to public IP addresses for Internet access (Correct answer)
- Assign MAC addresses to network interfaces
- Route packets between different VLANs
Correct answer: Translate private IP addresses to public IP addresses for Internet access
NAT translates private (RFC 1918) IP addresses used inside a network to one or more public IP addresses for communication over the Internet, conserving public IP space.
Question 5: Which protocol is used to synchronize the clocks of devices across a network?
- SNMP
- NTP (Correct answer)
- TFTP
- LLDP
Correct answer: NTP
NTP (Network Time Protocol) synchronizes clocks of networked devices to a reference time source, which is critical for accurate logging and security event correlation.
Question 6: What is a DHCP lease?
- A permanent IP address assignment that never expires
- A temporary IP address assignment for a specified period of time (Correct answer)
- A static route entry in the routing table
- A reservation of bandwidth on the network
Correct answer: A temporary IP address assignment for a specified period of time
A DHCP lease is the amount of time a client is allowed to use an IP address assigned by the DHCP server before it must renew or release the address.
Question 7: Which DNS record type specifies the mail server responsible for accepting email for a domain?
- A
- PTR
- MX (Correct answer)
- SOA
Correct answer: MX
MX (Mail Exchanger) records identify the mail servers that accept incoming email for a domain and their relative priority.
CCST Network Services & Protocols 1
Which protocol is used to automatically assign IP addresses, subnet masks, default gateways, and DNS server addresses to network hosts?