01
True or false
1 point
True or false: If a DHCP server is on a different subnet from its clients, a DHCP relay is commonly needed because DHCP broadcasts do not normally cross routers.
Free Practice Quiz Question List
6 Core Network Services Online Quiz Questions
Use this free practice quiz with 20 questions to review 6 Core Network Services, test your knowledge, and prepare for your next test or exam.
20 questions
02
True or false
1 point
True or false: Configuring a router with upstream DNS server addresses makes that router authoritative for the organization's DNS zone.
- A
True
- B
False
03
Choose one
1 point
A DHCP server is being configured for clients on subnet 192.168.10.0/24. Which action is essential for the scope to provide suitable client addresses?
- A
Use any available address range; the client will adapt to it.
- B
Configure a DHCP scope that matches the clients' subnet.
- C
Configure the DNS zone to match the clients' subnet.
- D
Enable NAT on the client so it can select a suitable address.
04
Choose one
1 point
An administrator needs a DNS record that maps an IP address to a name. Which record type serves that purpose?
- A
A
- B
AAAA
- C
PTR
- D
CNAME
05
Choose one
1 point
Why should a DHCP configuration exclude addresses used by the gateway, servers, and other statically addressed devices?
- A
It makes DHCP broadcasts cross routers.
- B
It helps prevent the dynamic pool from assigning addresses reserved for infrastructure or static devices.
- C
It converts the excluded addresses into DNS records.
- D
It allows clients to share one outside address using transport-layer ports.
06
Choose all
1 point
Select all settings a DHCP server can provide to a client in addition to its leased IP address.
- A
A subnet mask
- B
The contents of an authoritative DNS zone
- C
A default gateway
- D
A DNS server address
- E
A lease duration
07
Choose all
1 point
A LAN client sends traffic toward an external destination, but no NAT translation appears. Select all relevant checks to narrow down the problem.
- A
Confirm the LAN and WAN interfaces have the correct inside and outside roles.
- B
Check whether the access list matches the client's source subnet.
- C
Assume NAT is functioning because the client has an IP address.
- D
Verify the router has a working route to the WAN.
- E
Replace the DNS zone before checking whether the client is sending traffic.
08
Fill in the blank
1 point
PAT lets multiple inside IPv4 hosts share one outside address by distinguishing their connections with transport-layer .
09
Fill in the blank
1 point
During troubleshooting, a client can reach an external IP address, but name lookups fail. Investigate first.
10
Written response
1 point
What mapping direction does a PTR record provide? Answer with a short phrase.
11
Written response
1 point
What Cisco IOS command keyword is commonly used on a client-facing router interface to configure DHCP relay?
12
Open ended
1 point
A client reports that it cannot reach an external service by name. Describe a practical sequence of checks that uses the client configuration, gateway, DNS, and NAT evidence to narrow down the failure.
13
Choose one
1 point
A client fails to resolve files.example.test. Why might an administrator query the name directly against 192.168.10.10?
- A
It automatically changes the client's DHCP scope.
- B
It helps distinguish a server or record problem from an incorrect client resolver setting.
- C
It tests whether NAT has replaced the firewall.
- D
It determines whether DHCP exclusions include the gateway.
14
Choose one
1 point
A group of clients is on a particular IP subnet. Which DHCP pool configuration is appropriate for those clients?
- A
Use a pool for any subnet, since the default gateway determines the client subnet.
- B
Use a pool whose network and subnet mask match the client subnet.
- C
Use a pool that contains only the DNS server's address.
- D
Use a pool with a different subnet from the clients so addresses do not overlap.
15
Choose one
1 point
An administrator configures a router with upstream DNS server addresses. What does this configuration do by itself?
- A
The router is configured as a resolver; this alone does not make it authoritative for a DNS zone.
- B
The router becomes authoritative for every zone it can resolve.
- C
The router publishes an A record for each name it resolves.
- D
The router disables DNS caching on client devices.
16
True or false
1 point
A DHCP server on a different subnet will generally require a DHCP relay on the client-facing router interface because DHCP broadcasts do not normally cross routers.
- A
True
- B
False
17
Choose one
1 point
A small network needs multiple inside IPv4 hosts to share one outside address. Which NAT capability supports this?
- A
Assigning each inside host a different public address.
- B
Replacing DNS names with private IP addresses.
- C
Using transport-layer ports to distinguish connections that share one outside address.
- D
Blocking all traffic from inside hosts except DNS queries.
18
Written response
1 point
Which DNS record type maps a hostname to an IPv6 address?
19
Choose one
1 point
Why should a DHCP administrator exclude the gateway and statically addressed servers from the dynamic address range?
- A
To make the DHCP server authoritative for DNS records.
- B
To prevent the dynamic pool from assigning addresses already reserved for infrastructure or static devices.
- C
To ensure clients receive a different subnet mask from the gateway.
- D
To make DHCP broadcasts cross routers without a relay.
20
Written response
1 point
Which Windows command requests renewal of a client's DHCP lease?