WorksheetsDHCP & DNS Part 1
Total questions: 15
Worksheet time: 8mins
A user connects a laptop to the network and receives the IP address 169.254.23.88. Other users on the same network are working normally. What is the MOST likely cause?
Incorrect DNS server
DHCP server unreachable
Duplicate IP address
Wrong subnet mask
A company assigns static IPs to its printers. Recently, printers randomly lose network connectivity after a few hours. Which DHCP misconfiguration is MOST likely?
Lease time too long
Missing DHCP reservation
Missing exclusion range
Incorrect scope mask
A network administrator notices that IP addresses are being exhausted every morning in a guest Wi-Fi network, but many users leave after an hour. What is the BEST solution?
Add a DHCP relay
Increase TTL
Reduce DHCP lease time
Add DNS forwarders
A client successfully receives an IP address, subnet mask, and DNS server, but cannot access the internet. Which DHCP option is MOST likely missing?
DNS suffix
Default gateway
Lease duration
Reservation
A DHCP server is located on a different subnet than the clients. Clients fail to obtain IP addresses. What must be configured?
Static routes
DNS delegation
DHCP relay (IP helper)
NAT
Which DHCP process step confirms that the IP address has been officially assigned?
Discover
Offer
Request
Acknowledge
A DNS administrator changes a web server’s IP address, but users still reach the old server hours later. Why?
Recursive lookup failure
Incorrect A record
TTL has not expired
DNS uses TCP
Which DNS record is responsible for directing email traffic?
A
TXT
MX
SRV
A security analyst performs a reverse DNS lookup. Which record type is used?
NS
PTR
SOA
CNAME
A client sends a DNS query to its configured DNS server expecting a final answer, not referrals. What type of query is this?
Iterative
Recursive
Authoritative
Forwarding
Which DNS port/protocol combination is used for zone transfers?
UDP 53
TCP 53
UDP 443
TCP 25
Which DHCP configuration ensures a printer always receives the same IP address while still being managed by DHCP?
Exclusion
Static IP
Reservation
Scope extension
A network has the scope 192.168.10.0/24. The DHCP pool is configured as 192.168.10.1–192.168.10.254. Network devices begin experiencing IP conflicts. What is the MOST likely issue?
Lease duration too short
No exclusion range configured
DHCP relay missing
Scope mask incorrect
Which DNS server type contains the final answer for a domain?
Recursive resolver
Root server
TLD server
Authoritative server
A user reports that internal hostnames resolve correctly, but public websites do not. Which DNS design is MOST likely in use?
External-only DNS
Split DNS (internal vs external)
DNS relay
Forward lookup zones only
