6. Describe the Functionality of These IP Services: DHCP, DNS, NAT, SNMP, NTP 200-901 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the primary purpose of the lease time in DHCP?

   • AIt defines how long a client may use an assigned IP address before it must renew or reacquire it.
   • BIt determines the maximum number of IP addresses a DHCP server can assign.
   • CIt sets the time after which a DHCP server must reboot to apply new configurations.
   • DIt specifies the time interval between DHCP Discover messages sent by a client.
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A network administrator is setting up a new subnet for a guest Wi-Fi network. The DHCP server is configured with a scope for the subnet, but guests report that they can get an IP address but cannot access the internet. The administrator verifies that the default gateway is correctly configured in the DHCP scope. What is the most likely cause of the lack of internet access?

   • AThe DHCP lease duration is too short
   • BThe guest subnet is not in the DNS search list
   • CThe NAT configuration is not allowing traffic from the guest subnet
   • DThe DHCP scope is missing DNS server addresses
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A company runs a web application that must be reachable by customers via the hostname www.example.com. The application is hosted on a server with a private IP address behind a NAT device. The DNS administrator creates an A record for www.example.com pointing to the public IP address of the NAT device. Customers report intermittent failures when accessing the site. What is the most likely cause?

   • AThe web server's private IP address is not included in the DHCP reservation, so the server's IP address changes periodically, breaking the NAT translation.
   • BThe DNS server is not configured to perform recursive resolution, so it cannot resolve the A record for external clients.
   • CThe NAT device is not configured with a static one-to-one mapping for the web server, so multiple internal servers share the same public IP and the translation may not always reach the correct server.
   • DThe DNS A record has a short TTL, causing customers to query the DNS server too frequently and exceed the query rate limit.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   In the DNS hierarchical structure, what is the role of a top-level domain (TLD) server?

   • AIt is responsible for a specific domain extension such as .com or .org and provides referrals to authoritative name servers.
   • BIt translates domain names into MAC addresses for local network communication.
   • CIt stores the IP address for every domain name on the internet.
   • DIt is the first server contacted by a client when resolving any domain name.
   Reveal Solution Discussion Select an answer first
6. 10expert · medium

   A network administrator is configuring DHCP for a new subnet. The subnet has a mix of devices that require static IP assignments (e.g., printers, servers) and devices that should receive dynamic IPs. The administrator wants to ensure that the static devices always get the same IP. Which DHCP feature should be used?

   • ADHCP lease duration
   • BDHCP reservations
   • CDHCP scope options
   • DDHCP relay agent
   Reveal Solution Discussion Select an answer first