Quiz 2026 Cisco 100-150โ€“Efficient Exam Questions

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Cisco 100-150 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Standards and Concepts: Covers foundational networking models, terminology, network types, cloud service models, and common application-layer protocols.
Topic 2
  • Infrastructure: Covers hands-on identification of Cisco hardware, physical cabling in network setups, port types, and the basic concepts behind routing and switching.
Topic 3
  • Security: Covers firewall traffic filtering, core security principles including CIA and AAA, and basic wireless security configuration on home routers.
Topic 4
  • Diagnosing Problems: Covers structured troubleshooting approaches, packet capture with Wireshark, common diagnostic commands, remote access methods, and basic Cisco show commands.

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Cisco Certified Support Technician (CCST) Networking Sample Questions (Q22-Q27):

NEW QUESTION # 22
Which component of the AAA service security model provides identity verification?

Answer: D

Explanation:
Authentication is the process that verifies a user's or device's identity before granting access.


NEW QUESTION # 23
What is the CIDR prefix notation for a subnet mask of 255.255.0.0?

Answer: B

Explanation:
Classless Inter-Domain Routing (CIDR) notation represents the network portion of an IP address using a prefix length instead of traditional dotted-decimal subnet mask notation.
The prefix length identifies the number of consecutive binary 1 bits in the subnet mask.
For the subnet mask 255.255.0.0, the binary representation is:
11111111.11111111.00000000.00000000
The first octet contains eight binary 1 bits, and the second octet contains another eight binary 1 bits.
Therefore:
8 + 8 = 16 network bits
This produces a CIDR prefix length of /16.
A /16 subnet contains 65,536 total IPv4 addresses, with 65,534 normally available for host assignment after excluding the network and broadcast addresses.
Why the other options are incorrect:
A). /8: Corresponds to subnet mask 255.0.0.0.
B). /16: Corresponds to subnet mask 255.255.0.0.
C). /24: Corresponds to subnet mask 255.255.255.0.
D). /32: Corresponds to subnet mask 255.255.255.255 and identifies a single IPv4 address.
Cisco ' s official IPv4 addressing documentation confirms that a /16 prefix corresponds to the subnet mask
255.255.0.0.
References:
Cisco Certified Support Technician Networking (100-150) - Addressing and Subnet Formats, IPv4 Addressing and Subnet Masks.
Cisco - Configure IP Addresses and Unique Subnets for New Users.
Cisco ASA Series General Operations Configuration Guide - IPv4 Addresses and Subnet Masks.


NEW QUESTION # 24
A local company requires two networks in two new buildings. The addresses used in these networks must be in the private network range.
Which two address ranges should the company use? (Choose 2.)
Note: You will receive partial credit for each correct selection.

Answer: A,C

Explanation:
The private IP address ranges that are set aside specifically for use within private networks and not routable on the internet are as follows:
* Class A: 10.0.0.0 to 10.255.255.255
* Class B: 172.16.0.0 to 172.31.255.255
* Class C: 192.168.0.0 to 192.168.255.255
These ranges are defined by the Internet Assigned Numbers Authority (IANA) and are used for local communications within a private network123.
Given the options: A. 172.16.0.0 to 172.31.255.255 falls within the Class B private range. B. 192.16.0.0 to
192.16.255.255 is not a recognized private IP range. C. 11.0.0.0 to 11.255.255.255 is not a recognized private IP range. D. 192.168.0.0 to 192.168.255.255 falls within the Class C private range.
Therefore, the correct selections that the company should use for their private networks are A and D.
References :=
* Reserved IP addresses on Wikipedia
* Private IP Addresses in Networking - GeeksforGeeks
* Understanding Private IP Ranges, Uses, Benefits, and Warnings


NEW QUESTION # 25
Examine the connections shown in the following image. Move the cable types on the right to the appropriate connection description on the left. You may use each cable type more than once or not at all.

Answer:

Explanation:

Explanation:
Based on the image description provided, here are the cable types matched with the appropriate connection descriptions:
Connects Switch S1 to Router R1 Gi0/0/1 interface Cable Type : = Straight-through UTP Cable Connects Router R2 Gi0/0/0 to Router R3 Gi0/0/0 via underground conduit Cable Type : = Fiber Optic Cable Connects Router R1 Gi0/0/0 to Router R2 Gi0/0/1 Cable Type : = Crossover UTP Cable Connects Switch S3 to Server0 network interface card Cable Type : = Straight-through UTP Cable The choices are based on standard networking practices where:
* Straight-through UTP cables are typically used to connect a switch to a router or a network interface card.
* Fiber optic cables are ideal for long-distance, high-speed data transmission, such as connections through an underground conduit.
* Crossover UTP cables are used to connect similar devices, such as router-to-router connections.
These matches are consistent with the color-coded cables in the image: green for switch connections, yellow for router-to-router connections within the same rack, and blue for inter-rack connections. The use of these cables follows the Ethernet cabling standards.
* Connects Switch S1 to Router R1 Gi0/0/1 interface :
* Cable Type : Straight-through UTP Cable
* Explanation: A straight-through UTP cable is typically used to connect different types of devices, such as a switch to a router.
* Connects Router R2 Gi0/0/0 to Router R3 Gi0/0/0 via underground conduit :
* Cable Type : Fiber Optic Cable
* Explanation: Fiber optic cables are used for long-distance connections, such as those through an underground conduit between buildings.
* Connects Router R1 Gi0/0/0 to Router R2 Gi0/0/1 :
* Cable Type : Crossover UTP Cable
* Explanation: A crossover UTP cable is typically used to connect similar devices directly, such as router to router connections.
* Connects Switch S3 to Server0 network interface card :
* Cable Type : Straight-through UTP Cable
* Explanation: A straight-through UTP cable is typically used to connect a switch to an end device, such as a server.
* Straight-through UTP Cable : Used to connect different devices (e.g., switch to router, switch to server).
* Crossover UTP Cable : Used to connect similar devices directly (e.g., router to router, switch to switch).
* Fiber Optic Cable : Used for long-distance and high-speed connections, often between buildings or data centers.
:
Network Cable Types and Uses: Cisco Network Cables
Understanding Ethernet Cabling: Ethernet Cable Guide


NEW QUESTION # 26
Move each protocol from the list on the left to its correct example on the right.

Answer:

Explanation:

Explanation:
The correct matching of the protocols to their examples is as follows:
* DHCP: Assign the reserved IP address 10.10.10.200 to a web server at your company.
* DNS: Perform a query to translate companypro.net to an IP address.
* ICMP: Perform a ping to ensure that a server is responding to network connections.
Here's how each protocol corresponds to its example:
* DHCP (Dynamic Host Configuration Protocol) is used to assign IP addresses to devices on a network. In this case, DHCP would be used to assign the reserved IP address 10.10.10.200 to a web server.
* DNS (Domain Name System) is used to translate domain names into IP addresses. Therefore, to translate companypro.net to an IP address, DNS would be utilized.
* ICMP (Internet Control Message Protocol) is used for sending error messages and operational information indicating success or failure when communicating with another IP address. An example of this is using the ping command to check if a server is responding to network connections.
These protocols are essential for the smooth operation of networks and the internet.
* Perform a query to translate companypro.net to an IP address.
* DNS (Domain Name System): DNS is used to resolve domain names to IP addresses.
* Assign the reserved IP address 10.10.10.200 to a web server at your company.
* DHCP (Dynamic Host Configuration Protocol): DHCP is used to assign IP addresses to devices on a network.
* Perform a ping to ensure that a server is responding to network connections.
* ICMP (Internet Control Message Protocol): ICMP is used by network devices to send error messages and operational information, and it is the protocol used by the ping command.
* DNS (Domain Name System): DNS translates human-friendly domain names like "companypro.net" into IP addresses that computers use to identify each other on the network.
* DHCP (Dynamic Host Configuration Protocol): DHCP automatically assigns IP addresses to devices on a network, ensuring that no two devices have the same IP address.
* ICMP (Internet Control Message Protocol): ICMP is used for diagnostic or control purposes, and the ping command uses ICMP to test the reachability of a host on an IP network.
References:
* DNS Basics: What is DNS?
* DHCP Overview: What is DHCP?
* ICMP and Ping: Understanding ICMP


NEW QUESTION # 27
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