Courseiva
← 200-301
Full test
mediummultiple choiceObjective-mapped

Exhibit

Client output:
IP address: 192.168.50.22/24
Default gateway: 192.168.50.1
DNS server: 0.0.0.0

Exhibit: Users receive addresses from the correct subnet, but they cannot browse by hostname. Which DHCP option is most likely missing or incorrect?

Question 1mediummultiple choice
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Exhibit: Users receive addresses from the correct subnet, but they cannot browse by hostname. Which DHCP option is most likely missing or incorrect?

Full question →

Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Distractor review

Default-router option

A missing default gateway would affect off-subnet traffic, not just hostname resolution.

B

Best answer

DNS server option

The DNS server option tells clients where to send name-resolution queries.

C

Distractor review

Lease time option

Lease duration does not determine whether DNS lookups work.

D

Distractor review

TFTP server option

TFTP is used for file transfer, often by phones or booting clients.

Common exam trap

Common exam trap: answer the scenario, not the keyword

A common exam trap is to assume that if users receive IP addresses and can communicate on the network, all DHCP options are correctly configured. However, missing or incorrect DNS server information causes hostname resolution failures, which can be mistaken for broader connectivity problems. Another trap is confusing the default-router option with DNS; while the default-router enables routing beyond the local subnet, it does not affect DNS queries. Similarly, the lease time option affects IP address validity but not name resolution. Candidates must carefully distinguish these options to avoid selecting incorrect answers related to routing or lease duration when the real issue is DNS configuration.

Technical deep dive

How to think about this question

Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to automate the process of configuring devices on IP networks. DHCP assigns IP addresses and other network configuration parameters, such as subnet mask, default gateway, and DNS servers, to client devices. The DNS server option in DHCP is critical because it tells clients where to send DNS queries to resolve hostnames into IP addresses, enabling hostname-based browsing and communication. When a client device receives an IP address from a DHCP server, it also receives additional options that define how it interacts with the network. The DNS server option specifically provides the IP address of one or more DNS servers. Without this option correctly configured, clients cannot resolve domain names to IP addresses, even though they have valid IP addresses and default gateways. This results in users being unable to browse websites by hostname, despite having network connectivity. A common exam trap is to confuse the symptoms of missing DHCP options. For example, a missing default-router option affects routing beyond the local subnet but does not prevent hostname resolution. Similarly, lease time affects IP address validity but not DNS functionality. The TFTP server option is unrelated to DNS and is used mainly for device bootstrapping or phone configuration. Understanding the specific role of each DHCP option helps avoid misdiagnosis and ensures correct troubleshooting and configuration in Cisco networks.

KKey Concepts to Remember

  • The DHCP DNS server option provides clients with the IP address of DNS servers to enable hostname resolution on the network.
  • Clients with correct IP addresses and default gateways but missing DNS server information cannot resolve hostnames to IP addresses.
  • The default-router DHCP option specifies the gateway for off-subnet traffic but does not affect DNS resolution.
  • Lease time controls how long a client can use an assigned IP address but does not impact DNS query functionality.
  • The TFTP server option is used for device boot or configuration file transfers and does not influence DNS or hostname resolution.
  • DNS resolution is essential for browsing by hostname, and DHCP must supply accurate DNS server information for this to work.
  • In Cisco DHCP implementations, the DNS server option is configured with the 'dns-server' command under the DHCP pool.
  • Troubleshooting hostname resolution issues requires verifying that the DHCP server correctly provides the DNS server option.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Related practice questions

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?

Question 2

A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?

Question 3

What is the OSPF metric called?

Question 4

A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?

Question 5

A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?

Question 6

A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?

FAQ

Questions learners often ask

What does this 200-301 question test?

The DHCP DNS server option provides clients with the IP address of DNS servers to enable hostname resolution on the network.

What is the correct answer to this question?

The correct answer is: DNS server option — If clients get an IP address and default gateway but cannot resolve names, the usual problem is the DNS server information handed out by DHCP. Without that, hostname lookups fail even though IP connectivity may still exist.

What should I do if I get this 200-301 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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