This free Cisco CCNA IP Services practice test covers NAT and PAT, NTP, DHCP, DHCP relay, DNS, SNMP, syslog, and QoS basics — the IP services every Cisco network engineer configures daily. Each question includes a detailed explanation — perfect for Cisco CCNA 200-301 exam prep.
What is the purpose of DHCP Option 66?
Correct answer: C
Explanation: DHCP Option 66 specifies the TFTP server name or IP address. This is commonly used by network devices like IP phones and switches to download configuration files or firmware updates during boot process.
Which protocol operates on UDP port 69?
Correct answer: B
Explanation: TFTP (Trivial File Transfer Protocol) operates on UDP port 69. It is a simple file transfer protocol commonly used for transferring configuration files and firmware to network devices.
A network technician is troubleshooting DHCP issues on a network. Clients are unable to obtain IP addresses. The DHCP server shows no errors. Which of the following should be checked FIRST?
Correct answer: C
Explanation: Before checking server configuration, client configuration or DNS (which are all important), the first step should be verifying if the DHCP scope itself has available IP addresses. If the address pool is exhausted, no clients can obtain an IP, regardless of other settings. A is important, but C is the most likely initial cause. B is a client-side issue, and D is related to name resolution, not IP address assignment.
A company uses NAT to translate private IP addresses to public IP addresses. They're experiencing slow internet connectivity. Which of the following is the MOST likely cause?
Correct answer: B
Explanation: Slow internet connectivity with NAT points to a shortage of available public IP addresses in the pool. If the NAT pool is exhausted, new connections will be slow to establish or fail altogether. A impacts name resolution, not the speed of the connection. C may impact specific applications but won't cause overall slow connectivity. D is a physical layer problem and unrelated to NAT.
Which protocol is primarily used to synchronize time across a network?
Correct answer: C
Explanation: NTP (Network Time Protocol) is specifically designed for time synchronization. SNMP is for network management, DHCP for IP address allocation, and DNS for name resolution.
A network administrator wants to monitor network devices remotely. Which protocol is BEST suited for this task?
Correct answer: D
Explanation: SNMP (Simple Network Management Protocol) allows for remote monitoring and management of network devices. The other options are not designed for this purpose.
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