Cisco 100-150 Online Practice Questions and Exam Preparation

Cisco 100-150 Online Questions & Answers

• Question 21:

  Which Cisco IOS command will allow an administrator to remotely access a switch using SSH?

  A. line console 0
  B. ip domain-lookup
  C. ip ssh enable
  D. transport input ssh
  D. transport input ssh

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  Explanation

  The command transport input ssh under the VTY lines ensures that SSH access is enabled for remote management.

• Question 22:

  Which command will display the following output?

  

  A. show mac-address-table
  B. show cdp neighbor
  C. show inventory
  D. show ip interface
  B. show cdp neighbor

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  Explanation

  The command that will display the output provided, which includes capability codes, local interface details, device IDs, hold times, and platform port ID capabilities, is the show cdp neighbor command. This command is used in Cisco devices to display current information about neighboring devices detected by Cisco Discovery Protocol (CDP), which includes details such as the interface through which the neighbor is connected, the type of device, and the port ID of the device.

• Question 23:

  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 24:

  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

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

• Question 25:

  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 26:

  A support technician examines the front panel of a Cisco switch and sees 4 Ethernet cables connected in the first four ports. Ports 1, 2, and 3 have a green LED. Port 4 has a blinking green light. What is the state of the Port 4?

  A. Link is up with cable malfunctions.
  B. Link is up and not stable.
  C. Link is up and active.
  D. Link is up and there is no activity.
  C. Link is up and active.

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  Explanation

  On a Cisco switch, a port with a blinking green LED typically indicates that the port is up (active) and is currently transmitting or receiving data. This is a normal state indicating active traffic on the port.

  Link is up with cable malfunctions: Usually indicated by an amber or blinking amber light.

  Link is up and not stable: Not typically indicated by a green blinking light.

  Link is up and there is no activity: Would be indicated by a solid green light without blinking.

• Question 27:

  Which device protects the network by permitting or denying traffic based on IP address, port number, or application?

  A. Firewall
  B. Access point
  C. VPN gateway
  D. Intrusion detection system
  A. Firewall

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  Explanation

  Firewall: A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It permits or denies traffic based on IP addresses, port numbers, or applications.

  Access Point: This is a device that allows wireless devices to connect to a wired network using Wi-Fi. It does not perform traffic filtering based on IP, port, or application.

  VPN Gateway: This device allows for secure connections between networks over the internet, but it is not primarily used for traffic filtering based on IP, port, or application.

  Intrusion Detection System (IDS): This device monitors network traffic for suspicious activity and policy violations, but it does not actively permit or deny traffic.

• Question 28:

  Match the network type with the correct example.

  A. Please check the answer in the explanation
  B. PlaceHolder
  C. PlaceHolder
  D. PlaceHolder
  A. Please check the answer in the explanation

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  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 29:

  Which address is included in the 192.168.200.0/24 network?

  A. 192.168.199.13
  B. 192.168.200.13
  C. 192.168.201.13
  D. 192.168.1.13
  B. 192.168.200.13

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  Explanation

  192.168.200.0/24 Network: This subnet includes all addresses from 192.168.200.0 to 192.168.200.255. The /24 indicates a subnet mask of 255.255.255.0, which allows for 256 addresses.

  192.168.199.13: This address is in the 192.168.199.0/24 subnet, not the 192.168.200.0/24 subnet.

  192.168.200.13: This address is within the 192.168.200.0/24 subnet.

  192.168.201.13: This address is in the 192.168.201.0/24 subnet, not the 192.168.200.0/24 subnet.

  192.168.1.13: This address is in the 192.168.1.0/24 subnet, not the 192.168.200.0/24 subnet.

• Question 30:

  Which type of address is automatically assigned to a device when no DHCP server is available?

  A. Private IP address
  B. Loopback address
  C. Link-local address
  D. Public IP address
  C. Link-local address

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  Explanation

  When a device is unable to obtain an IP address from a DHCP server, it assigns itself a link-local address from the 169.254.0.0/16 range.