Cisco 100-150 Online Practice Questions and Exam Preparation

Cisco 100-150 Online Questions & Answers

• Question 1:

  HOTSPOT

  Computers in a small office are unable to access companypro.net. You run the ipconfig command on one of the computers. The results are shown in the exhibit.

  You need to determine if you can reach the router.

  

  Which command should you use? Complete the command by selecting the correct options from each drop- down lists.

  

  

  Explanation

  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.

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  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.

  How to Use the Ping Command

  Testing Network Connectivity with the Ping Command

  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

• Question 2:

  HOTSPOT

  An app on a user's computer is having problems downloading data. The app uses the following URL to download data:

  https://www.companypro.net:7100/api

  You need to use Wireshark to capture packets sent to and received from that URL.

  Which Wireshark filter options would you use to filter the results? Complete the command by selecting the correct option from each drop-down list.

  Note: You will receive partial credit for each correct selection.

  

  

  Explanation

  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

• Question 3:

  HOTSPOT

  For each statement about bandwidth and throughput, select True or False.

  Note: You will receive partial credit for each correct selection.

  

  

  Explanation

  Statement 1: Low bandwidth can increase network latency.

  True: Low bandwidth can result in increased network latency because the network may become congested, leading to delays in data transmission.

  Statement 2: High levels of network latency decrease network bandwidth.

  False: High levels of network latency do not decrease the available network bandwidth, but they do affect the perceived performance and throughput of the network.

  Statement 3: You can increase throughput by decreasing network latency.

  True: Decreasing network latency can increase throughput because data can be transmitted more quickly and efficiently without delays.

  Bandwidth vs. Latency: Bandwidth refers to the maximum rate at which data can be transferred over a network path. Latency is the time it takes for a data packet to travel from the source to the destination.

  Low bandwidth can cause network congestion, which can increase latency as packets wait to be transmitted.

  High latency does not reduce the actual bandwidth but can affect the overall performance and efficiency of data transmission.

  Reducing latency can lead to higher throughput because the network can handle more data in a given period without delays.

  References:

  Network Performance Metrics: Cisco Network Performance

  Understanding Bandwidth and Latency: Bandwidth vs. Latency

• Question 4:

  DRAG DROP

  Move the MFA factors from the list on the left to their correct examples on the right. You may use each factor once, more than once, or not at all.

  Note: You will receive partial credit for each correct selection.

  Select and Place:

  

  

  Explanation

  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

  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)

  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

  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

• Question 5:

  DRAG DROP

  Move each protocol from the list on the left to its correct example on the right.

  Select and Place:

  

  

  Explanation

  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

• Question 6:

  DRAG DROP

  Move the security options from the list on the left to its characteristic on the right. You may use each security option once, more than once, or not at all.

  Note: You will receive partial credit for each correct answer.

  Select and Place:

  

  

  Explanation

  WPA2-Enterprise: Uses a RADIUS server for authentication

  WEP: Uses a minimum of 40 bits for encryption

  WPA2-Personal: Uses AES and a pre-shared key for authentication

  Here's why each security option matches the characteristic:

  WPA2-Enterprise uses a RADIUS server for authentication, which provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service.

  WEP (Wired Equivalent Privacy) is an outdated security protocol that uses a minimum of 40 bits for encryption (and up to 104 bits), which is relatively weak by today's standards.

  WPA2-Personal (Wi-Fi Protected Access 2 - Personal) uses the Advanced Encryption Standard (AES) for encryption and a pre-shared key (PSK) for authentication, which is shared among users to access the network.

  These security options are essential for protecting wireless networks from unauthorized access and ensuring data privacy.

• Question 7:

  Match the network type with the correct example.

  Please check the answer in the explanation
  PlaceHolder
  PlaceHolder
  PlaceHolder

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  explanation:

  Explanation

  Two home office computers are connected to a switch by Ethernet cables.

  Network Type: LAN (Local Area Network)

  A LAN connects devices within a limited area such as a home, office, or building, using Ethernet cables or Wi-Fi.

  Three government buildings in the same city connect to a cable company over coaxial cables.

  Network Type: MAN (Metropolitan Area Network)

  A MAN connects networks across a city or campus, often using fiber optic or coaxial cables.

  A cell phone connects to a Bluetooth headset.

  Network Type: PAN (Personal Area Network)

  A PAN connects devices within a personal workspace, typically using wireless technologies like Bluetooth.

  A financial institution connects its branches through a telecommunications service provider.

  Network Type: WAN (Wide Area Network)

  A WAN connects multiple LANs over long distances, often using leased lines or satellite links provided by telecommunications companies.

  LAN (Local Area Network): Used for connecting devices within a small geographical area such as a single building or home.

  MAN (Metropolitan Area Network): Covers a larger geographical area than a LAN, typically a city or campus.

  PAN (Personal Area Network): Connects devices within the range of an individual person, such as connecting a phone to a Bluetooth headset.

  WAN (Wide Area Network): Spans large geographical areas, connecting multiple LANs across cities, countries, or continents.

  References:

  Network Types Overview: Cisco Networking Basics

  Understanding Different Network Types: Network Types Guide

• Question 8:

  Which protocol is responsible for dynamically resolving MAC addresses from IP addresses?

  A. ICMP
  B. ARP
  C. RIP
  D. BGP
  B. ARP

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  explanation:

  Explanation

  The Address Resolution Protocol (ARP) is used to dynamically map an IP address to a MAC address within a local network.

• Question 9:

  Which type of attack occurs when an attacker sends a large number of TCP SYN packets without completing the three-way handshake?

  A. ARP poisoning
  B. DNS spoofing
  C. SYN flood
  D. Man-in-the-middle attack
  C. SYN flood

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  explanation:

  Explanation

  A SYN flood attack occurs when an attacker overwhelms a target system with a large number of incomplete TCP handshake requests, exhausting resources and preventing legitimate connections.

• Question 10:

  Which command is used to save the current configuration of a Cisco router or switch so that it is applied after a reboot?

  A. write memory
  B. copy running-config startup-config
  C. save config
  D. write save
  B. copy running-config startup-config

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  explanation:

  Explanation

  The copy running-config startup-config command saves the current running configuration to the startup configuration file, ensuring it persists after a reboot.