100-150 Cisco Certified Support Technician Networking Exam Questions and Answers

When prioritizing trouble tickets, the most critical issues affecting business operations or high-impact activities should be addressed first. Here ' s a breakdown of the tickets:

Ticket 1 : Relocation of a printer, while necessary, is not urgent and does not impact critical operations.

Ticket 2 : An ongoing webinar losing internet access is critical, especially if the webinar is time-sensitive and involves multiple participants.

Ticket 3 : Slower response time for a cloud-based application is important but typically not as urgent as a complete loss of internet access for a live event.

Ticket 4 : Wireless access down in the cafeteria affects users but does not have the same immediate impact as a live webinar losing connectivity.

Thus, the correct answer is B. Ticket 2: An online webinar is taking place in the conference room. The video conferencing equipment lost internet access.

References :=

IT Help Desk Best Practices

Prioritizing IT Support Tickets

To determine if you can reach the router, you should use the ping command followed by the IP address of the router. The ping command is a network utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer.

The Default Gateway in the ipconfig results is typically the router’s IP address in a home or small office network. In this case, the Default Gateway is 192.168.0.1 , which is the address you would ping to check connectivity to the router.

References :=

How to Use the Ping Command

Testing Network Connectivity with the Ping Command

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To determine if you can reach the router, you should use the ping command with the IP address of the router.

Command : ping

Target : 192.168.0.1

So, the completed command is:

ping 192.168.0.1

Step by Step Comprehensive and Detailed Explanation :

ping : The ping command sends ICMP Echo Request messages to the target IP address and waits for an Echo Reply. It is commonly used to test the reachability of a network device.

192.168.0.1 : This is the IP address of the default gateway (the router) as shown in the ipconfig output. Pinging this address will help determine if the computer can communicate with the router.

References :

Using the ping Command: ping Command Guide

The tracert command output shows the path taken to reach the destination IP address, 192.168.1.10. The command output indicates:

• Hops 1 and 2 are successfully reached.

• Hop 3 times out, meaning the router at hop 3 did not respond to the tracert request. However, this does not necessarily indicate a problem with forwarding packets, as some routers may be configured to block or not respond to ICMP requests.

• Hops 4 and 5 are successfully reached, with hop 5 being the destination IP 192.168.1.10, indicating that the server is reachable.

Thus, the correct answer is C. The server with the address 192.168.1.10 is reachable over the network.

References :=

• Cisco Traceroute Command

• Understanding Traceroute

The tracert command output indicates that the server with the address 192.168.1.10 is reachable over the network. The asterisk (*) at hop 3 suggests that the probe sent to that hop did not return a response, which could be due to a variety of reasons such as a firewall blocking ICMP packets or the router at that hop being configured not to respond to ICMP requests. However, since the subsequent hops (4 and 5) are showing response times, it means that the packets are indeed getting through and the server is reachable12.

References :=

• How to Use Traceroute Command to Read Its Results

• How to Use the Tracert Command in Windows

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.

References :

Network Cable Types and Uses: Cisco Network Cables

Understanding Ethernet Cabling: Ethernet Cable Guide

To capture packets sent to and received from the URL https://www.companypro.net:7100/api using Wireshark, you would use the following filter options:

Protocol : tcp

Filter Type : port

Port Number : 7100

This filter setup in Wireshark will display all TCP packets that are sent to or received from port 7100, which is the port specified in the URL for the API service. Since HTTPS typically uses TCP as the transport layer protocol, filtering by TCP and the specific port number will help isolate the relevant packets for troubleshooting the app’s data download issues.

cp : The app is using HTTPS, which relies on the TCP protocol for communication.

port : The specific port number used by the application, which in this case is 7100.

7100 : This is the port specified in the URL ( https://www.companypro.net:7100/api ).

This filter will capture all TCP traffic on port 7100, allowing you to analyze the packets related to the application ' s data download.

References :

Wireshark Filters: Wireshark Display Filters

IPv6 addresses can be compressed by removing leading zeros and replacing consecutive groups of zeros with a double colon (::). Here’s how to compress the address 2001:0db8:0000:0016:0000:001b:2000:0056:

Remove leading zeros from each segment:

2001:db8:0000:0016:0000:001b:2000:0056 becomes 2001:db8:0:16:0:1b:2000:56

Replace the longest sequence of consecutive zeros with a double colon (::). In this case, the two consecutive zeros between the 16 and 1b:

2001:db8:0:16::1b:2000:56

Thus, the most compressed valid format of the IPv6 address is 2001:db8:0:16::1b:2000:56.

References :=

Cisco Learning Network

IPv6 Addressing (Cisco)

The correct matching of the MFA factors to their examples is as follows:

Entering a one-time security code sent to your device after logging in : Possession

Holding your phone to your face to be recognized : Inherence

Specifying your user name and password to log on to a service : Knowledge

Here’s why each factor matches the example:

Possession : This factor is something the user has, like a mobile device. A one-time security code sent to this device falls under this category.

Inherence : This factor is something the user is, such as a biometric characteristic. Facial recognition using a phone is an example of this factor.

Knowledge : This factor is something the user knows, like a password or PIN.

Multi-Factor Authentication (MFA) enhances security by requiring two or more of these factors to verify a user’s identity before granting access.

Entering a one-time security code sent to your device after logging in .

Factor : Possession

Explanation: This factor relates to something you have, such as a device that receives a security code.

Holding your phone to your face to be recognized .

Factor : Inference (typically referred to as Inherence or Biometric)

Explanation: This factor relates to something you are, such as biometric authentication like facial recognition.

Specifying your username and password to log on to a service .

Factor : Knowledge

Explanation: This factor relates to something you know, such as a username and password.

Possession Factor : This involves something the user has in their possession. Receiving a one-time security code on a device (e.g., phone) is an example of this.

Inference Factor (Inherence/Biometric) : This involves something inherent to the user, such as biometric verification (e.g., facial recognition or fingerprint scanning).

Knowledge Factor : This involves something the user knows, such as login credentials (username and password).

References :

Multi-Factor Authentication (MFA) Explained: MFA Guide

Understanding Authentication Factors: Authentication Factors

The header of a UDP (User Datagram Protocol) segment includes port numbers . Specifically, it contains the source port number and the destination port number, which are used to identify the sending and receiving applications. UDP headers do not include IP addresses or MAC addresses, as those are part of the IP and Ethernet frame headers, respectively. Additionally, UDP does not use sequence numbers, which are a feature of TCP (Transmission Control Protocol) for ensuring reliable delivery of data segments 1 .

References :=

Segmentation Explained with TCP and UDP Header

User Datagram Protocol (UDP) - GeeksforGeeks

Which three fields are used in a UDP segment header

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UDP Header : The header of a UDP segment includes the following key fields:

Source Port : The port number of the sending application.

Destination Port : The port number of the receiving application.

Length : The length of the UDP header and data.

Checksum : Used for error-checking the header and data.

IP Addresses : These are included in the IP header, not the UDP header.

Sequence Numbers : These are part of the TCP header, not UDP.

MAC Addresses : These are part of the Ethernet frame header and are not included in the UDP header.

References :

RFC 768 - User Datagram Protocol: RFC 768

Cisco Guide on UDP: Cisco UDP Guide

Router

The show running-config command is used on a Cisco router to display the current operational settings that are actively configured in the router’s RAM. This command outputs all the configura tions that are currently being executed by the router, which includes interface configurations, routing protocols, access lists, and other settings. Unlike show startup-config , which shows the saved configuration that the router will use on the next reboot, show running-config reflects the live, current configuration in use.

References := The information is supported by multiple sources that detail the use of Cisco commands, particularly the show running-config command as the standard for viewing the active configuration on a Cisco device 1 2 3 .

show running-config : This command displays the current configuration running on the router. It includes all the operational settings and configurations applied to the router.

show protocols : This command shows the status of configured protocols on the router but not the entire configuration.

show startup-config : This command displays the configuration saved in NVRAM, which is used to initialize the router on startup, but not necessarily the current running configuration.

show version : This command provides information about the router ' s software version, hardware components, and uptime but does not display the running configuration.

References :

Cisco IOS Commands: Cisco IOS Commands