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IP Services — CCNA practice questions

Domain 4 of the Cisco CCNA (200-301) exam. 15 questions on this domain in the full bank — here are four free samples with answers and explanations.

Question 1 · Difficulty 3/5

What is the primary purpose of static NAT?
  1. Allow many inside hosts to share one public IP
  2. Map one inside local address to one inside global address permanently
  3. Translate only UDP traffic
  4. Encrypt traffic between private and public networks
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Correct answer: B

Map one inside local address to one inside global address permanently
Static NAT creates a permanent one-to-one mapping between an inside local address and an inside global address. This is commonly used when an internal server must always be reachable through the same public IP. Option A describes PAT or overload, while options C and D do not describe NAT behavior.

Question 2 · Difficulty 2/5

What is the purpose of NTP on a network device?
  1. Assign IP addresses automatically
  2. Synchronize time with a reference clock
  3. Resolve hostnames to IP addresses
  4. Copy files between devices
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Correct answer: B

Synchronize time with a reference clock
NTP synchronizes the clock on a network device with a trusted time source. Accurate time is essential for log correlation, certificate validation, and troubleshooting. DHCP assigns IP addresses, DNS resolves names, and file transfer is handled by protocols such as TFTP or FTP.

Question 3 · Difficulty 2/5

Which protocol is responsible for resolving a hostname such as server.example.com into an IP address?
  1. DHCP
  2. SNMP
  3. DNS
  4. Syslog
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Correct answer: C

DNS
DNS translates hostnames into IP addresses so devices can locate services by name. DHCP provides addressing information, SNMP is used for monitoring, and Syslog is used for event logging. Name resolution is specifically the function of DNS.

Question 4 · Difficulty 3/5

During the DHCP DORA process, which message does a client broadcast after receiving an offer, to formally select that offer and request the proposed IPv4 configuration from the server?
  1. DHCPDISCOVER
  2. DHCPNAK
  3. DHCPREQUEST
  4. DHCPDECLINE
Show answer & explanation

Correct answer: C

DHCPREQUEST
After receiving a DHCPOFFER, the client broadcasts DHCPREQUEST to formally select one server's offer and request the proposed configuration; this message is client-originated and is the third step in the DORA sequence. DHCPDISCOVER is the client's initial broadcast, DHCPNAK is a server rejection, and DHCPDECLINE is sent by the client when it detects the offered address is already in use. The server then finalizes the lease with DHCPACK.

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