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100-140 exam dumps: questions 201 to 300 of 389

Page 3 of the free 100-140 question bank for the Cisco Certified Support Technician (CCST) IT Support exam. Questions 201 to 300 are listed below, the first 5 in full with answers and explanations. Back to page 1 for the exam overview and FAQ.

Question bank last updated January 2025

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Free 100-140 practice questions

Questions 201 to 205 of 389

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100-140 Question 201

Single answer

A technician is troubleshooting a network issue and needs to determine if the IP address 192.168.50.25 belongs to the correct private subnet. The network is configured with a subnet range of 192.168.50.0/24. Is the IP address in the correct subnet, and is it a private IP address?

A
Yes, the IP address belongs to the subnet and is a private IP address.
B
Yes, the IP address belongs to the subnet but it is not a private IP address.
C
No, the IP address does not belong to the subnet, but it is a private IP address.
D
No, the IP address does not belong to the subnet and it is not a private IP address.

Show answer and explanation

Correct answer: A

Explanation

The subnet 192.168.50.0/24 encompasses IP addresses from 192.168.50.1 to 192.168.50.254. The IP address 192.168.50.25 falls within this range, making it part of the subnet. Additionally, the IP address is within the private address range defined in RFC 1918 (192.168.0.0, 192.168.255.255). Therefore, the IP address 192.168.50.25 is both in the correct subnet and is a private IP address.

A. Correct.
This is correct because 192.168.50.25 falls within the range of the subnet 192.168.50.0/24 (192.168.50.1 to 192.168.50.254) and is part of the private IP range (192.168.0.0, 192.168.255.255).
B. Incorrect.
This is incorrect because the IP address 192.168.50.25 is a private IP address as defined in RFC 1918.
C. Incorrect.
This is incorrect because the IP address 192.168.50.25 does belong to the subnet 192.168.50.0/24.
D. Incorrect.
This is incorrect because the IP address 192.168.50.25 both belongs to the subnet and is a private IP address.

100-140 Question 202

Select 2

You are tasked with configuring a network device. The device is assigned the IP address 192.168.10.15 with a subnet mask of 255.255.255.0 (CIDR 24). Which of the following IP addresses can connect to the device within the same subnet?

A
192.168.10.50
B
192.168.11.15
C
192.168.10.254
D
192.168.9.200
E
10.0.0.1

Show answer and explanation

Correct answers: A, C

Explanation

To determine if two IP addresses are in the same subnet, you must compare the network portion of their addresses using the subnet mask. In this case, the subnet mask 255.255.255.0 means that only the first three octets must match for two addresses to be in the same subnet. Therefore, only 192.168.10.50 and 192.168.10.254 are in the same subnet as 192.168.10.15.

A. Correct.
192.168.10.50 is in the same subnet because the first three octets match the subnet range defined by the 255.255.255.0 mask.
B. Incorrect.
192.168.11.15 is not in the same subnet because the third octet (11) is different from the device's subnet (10).
C. Correct.
192.168.10.254 is in the same subnet since it shares the same first three octets as the device's IP address.
D. Incorrect.
192.168.9.200 is not in the same subnet because the third octet (9) is different from the device's subnet (10).
E. Incorrect.
10.0.0.1 is not in the same subnet because it is a completely different IP range and does not match the 192.168.X.X private range.

100-140 Question 203

Single answer

You are troubleshooting a connectivity issue between two devices on a company network. Device A has the IP address 192.168.1.25 with a subnet mask of 255.255.255.0, and Device B has the IP address 192.168.2.10 with the same subnet mask. Based on the IP address ranges and subnet mask, what is the most likely cause of the issue?

A
Both devices are in the same subnet, so the issue is unrelated to IP addressing.
B
Device B's IP address is a public IP and cannot communicate with Device A's private IP.
C
The subnet mask does not allow these two IP addresses to be in the same subnet.
D
Device A's IP address is reserved for public use and cannot communicate with Device B.

Show answer and explanation

Correct answer: C

Explanation

The subnet mask 255.255.255.0 divides the network into distinct subnets where the first three octets determine the network portion. Device A is on the 192.168.1.x subnet, while Device B is on the 192.168.2.x subnet. These subnets are different, and the devices cannot communicate directly without proper routing or configuration.

A. Incorrect.
Incorrect. The two devices are not in the same subnet based on the subnet mask and their IP addresses.
B. Incorrect.
Incorrect. Both IP addresses, 192.168.1.25 and 192.168.2.10, are private and not public.
C. Correct.
Correct. The subnet mask of 255.255.255.0 creates a range of IP addresses that separates 192.168.1.x and 192.168.2.x into different subnets, preventing communication without routing.
D. Incorrect.
Incorrect. The IP address 192.168.1.25 is a private IP address, not a reserved public IP.

100-140 Question 204

Single answer

A user reports that they are unable to access websites or any resources outside their local network. Upon investigation, you discover that their computer has a valid IP address and subnet mask but no default gateway is configured. What is the most likely reason for this issue?

A
The computer cannot communicate with devices on the same local network.
B
The computer cannot communicate with devices outside the local network.
C
The computer cannot resolve domain names to IP addresses.
D
The computer cannot send or receive any packets, even within the local network.

Show answer and explanation

Correct answer: B

Explanation

The default gateway acts as the route to send traffic outside the local network. If it is not configured, the computer cannot reach devices or resources beyond the local subnet, such as websites or external servers. However, communication within the local network remains unaffected.

A. Incorrect.
A missing default gateway does not impact communication within the same local network, as devices on the same subnet can communicate directly.
B. Correct.
Without a default gateway, the computer cannot route traffic to devices outside its local network, such as websites on the internet or external resources.
C. Incorrect.
While DNS resolution issues can prevent access to websites, they are unrelated to the configuration of a default gateway.
D. Incorrect.
The computer can still send and receive packets within the local network even if a default gateway is not configured, as long as the local IP and subnet mask are correctly set.

100-140 Question 205

Select 2

A user reports that they cannot access any websites or external resources, but they can successfully communicate with devices on their local network. As part of your troubleshooting steps, you suspect an issue with the default gateway. Which of the following could be a likely cause of this problem?

A
The default gateway IP address is incorrectly configured on the user's device.
B
The default gateway device (e.g., router) is powered off or unresponsive.
C
The subnet mask on the user's device is misconfigured.
D
The user's device has a duplicate IP address on the network.
E
The DNS server address on the user's device is configured incorrectly.

Show answer and explanation

Correct answers: A, B

Explanation

The default gateway serves as the device that routes traffic from a local network to external networks. If the default gateway IP address is incorrectly configured, or if the gateway device itself is unresponsive, the user's device will be unable to send traffic to external networks, causing the issue described in the scenario.

A. Correct.
If the default gateway IP address is incorrectly configured, the user's device will not know where to send traffic destined for external networks, preventing access to websites or external resources.
B. Correct.
If the default gateway device is powered off or unresponsive, it cannot route traffic from the local network to external networks, causing connectivity issues.
C. Incorrect.
A misconfigured subnet mask could cause communication issues within the local network but would not directly affect the user's ability to access external resources if the default gateway is correctly configured.
D. Incorrect.
A duplicate IP address can cause network conflicts and connectivity issues, but it is unrelated to the specific issue of accessing external resources through the default gateway.
E. Incorrect.
An incorrectly configured DNS server address could cause issues resolving domain names (e.g., www.google.com), but it would not prevent communication with external resources if the user attempted to access them via their IP addresses.

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100-140 practice questions 201 to 300 of 389

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