Cisco Cisco Certifications CCST-NETWORKING Questions & Answers

• Question 31:

  A user reports that a company website is not available. The help desk technician issues a tracert command to determine if the server hosting the website isreachable over the network. The output of the command is shown as follows:

  

  What can you tell from the command output?

  A. The router at hop 3 is not forwarding packets to the IP address 192.168.1.10.

  B. The server address 192.168.1.10 is being blocked by a firewall on the router at hop 3.

  C. The server with the address 192.168.1.10 is reachable over the network.

  D. Requests to the web server at 192.168.1.10 are being delayed and time out.

  Correct Answer: C

  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 reachable.

  References:

  -How to Use Traceroute Command to Read Its Results

  -How to Use the Tracert Command in Windows

• Question 32:

  Which two pieces of information should you include when you initially create a support ticket? (Choose 2.)

  A. A detailed description of the fault

  B. Details about the computers connected to the network

  C. A description of the conditions when the fault occurs

  D. The actions taken to resolve the fault

  E. The description of the top-down fault-finding procedure

  Correct Answer: AC

  Statement A: "A detailed description of the fault." This is essential for support staff to understand the nature of the problem and begin troubleshooting effectively. Statement C: "A description of the conditions when the fault occurs." This helps

  in reproducing the issue and identifying patterns that might indicate the cause of the fault.

  Statement B: "Details about the computers connected to the network." While useful, this is not as immediately critical as understanding the fault itself and the conditions under which it occurs.

  Statement D: "The actions taken to resolve the fault." This is important but typically follows the initial report.

  Statement E: "The description of the top-down fault-finding procedure." This is more of a troubleshooting methodology than information typically included in an initial support ticket.

  References:

  Best Practices for Submitting Support Tickets: Support Ticket Guidelines

• Question 33:

  Which wireless security option uses a pre-shared key to authenticate clients?

  A. WPA2-Personal

  B. 802.1x

  C. 802.1q

  D. WPA2-Enterprise

  Correct Answer: A

  WPA2-Personal, also known as WPA2-PSK (Pre-Shared Key), is the wireless security option that uses a pre-shared key to authenticate clients. This method is designed for home and small office networks and doesn't require an

  authentication server. Instead, every user on the network uses the same key or passphrase to connect.

  References:

  -What is a Wi-Fi Protected Access Pre-Shared Key (WPA-PSK)?

  -Exploring WPA-PSK and WiFi Security

  =========================

  -WPA2-Personal: This wireless security option uses a pre-shared key (PSK) for authentication. Each client that connects to the network must use this key to gain access. It is designed for home and small office networks where simplicity and

  ease of use are important.

  -WPA2-Enterprise: Unlike WPA2-Personal, WPA2-Enterprise uses 802.1x authentication with an authentication server (such as RADIUS) and does not rely on a pre-shared key. -802.1x: This is a network access control protocol for LANs,

  particularly wireless LANs. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN. -802.1q: This is a networking standard that supports VLAN tagging on Ethernet networks and is not related to wireless

  security.

  References:

  Cisco Documentation on WPA2 Security: Cisco WPA2 Understanding Wireless Security: Wireless Security Guide

• Question 34:

  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

  Correct Answer: A

  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. References: Understanding Firewalls: Firewall Basics

• Question 35:

  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.

  Hot Area:

  

  Correct Answer:

  

  To determine if you can reach the router, you should use thepingcommand followed by the IP address of the router. Thepingcommand 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 theipconfigresults is typically the router's IP address in a home or small office network. In this case, the Default

  Gateway is192.168.0.1, 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 =========================

  To determine if you can reach the router, you should use thepingcommand 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 theipconfigoutput. Pinging this address will help determine if the computer can communicate with the router.

  References:

  Using the ping Command: ping Command Guide

• Question 36:

  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.

  Hot Area:

  

  Correct Answer:

  

  To capture packets sent to and received from the URLhttps://www.companypro.net:7100/apiusing 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 37:

  HOTSPOT

  You plan to use a network firewall to protect computers at a small office.

  For each statement about firewalls, select True or False.

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

  Hot Area:

  

  Correct Answer:

  

  A firewall can direct all web traffic to a specific IP address. A firewall can block traffic to specific ports on internal computers. A firewall can prevent specific apps from running on a computer.

  Directing Web Traffic: Firewalls can manage traffic redirection using NAT and port forwarding rules to route web traffic to designated servers or devices within the network.

  Blocking Specific Ports: Firewalls can enforce security policies by blocking or allowing traffic based on port numbers, ensuring that only permitted traffic reaches internal systems.

  Application Control: While firewalls manage network traffic, preventing applications from running typically requires software specifically designed for endpoint protection and application management.

  References:

  Understanding Firewalls: Firewall Capabilities

  Network Security Best Practices: Network Security Guide

• Question 38:

  HOTSPOT

  You purchase a new Cisco switch, turn it on, and connect to its console port. You then run the following command:

  

  For each statement about the output, select True or False. Note: You will receive partial credit for each correct selection.

  Hot Area:

  

  Correct Answer:

  

  The two interfaces are administratively shut down:

  The two interfaces have default IP addresses assigned:

  The two interfaces can communicate over Layer 2:

  Interface Status: The absence of the "shutdown" command means the interfaces are not administratively shut down.

  IP Address Assignment: There is no evidence in the output that IP addresses have been assigned to the interfaces, which would typically be shown as "ip address" entries.

  Layer 2 Communication: Switch interfaces in their default state operate at Layer 2, enabling them to forward Ethernet frames and participate in Layer 2 communication.

  References:

  Cisco IOS Interface Configuration: Cisco Interface Configuration Understanding Cisco Switch Interfaces: Cisco Switch Interfaces

• Question 39:

  HOTSPOT

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

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

  Hot Area:

  

  Correct Answer:

  

  Statement 1: Low bandwidth can increase network latency. Statement 2: High levels of network latency decrease network bandwidth. Statement 3: You can increase throughput by decreasing network latency.

  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.

  References:

  Network Performance Metrics: Cisco Network Performance Understanding Bandwidth and Latency: Bandwidth vs. Latency

• Question 40:

  HOTSPOT

  You want to list the IPv4 addresses associated with the host name www.companypro.net.

  Complete the command by selecting the correct option from each drop-down list.

  Hot Area:

  

  Correct Answer:

  

  To list the IPv4 addresses associated with the host name www.companypro.net, you should use the following command:

  nslookup www.companypro.net

  This command will query the DNS servers to find the IP address associated with the hostname provided.If you want to ensure that it returns the IPv4 address, you can specify the-type=Aoption, which stands for Address records that hold IPv4

  addresses1. However, thenslookupcommand by default should return the IPv4 address if available. To list the IPv4 addresses associated with the host namewww.companypro.net, you should use thenslookupcommand.

  Command: nslookup

  Target:www.companypro.net

  So, the completed command is:

  nslookupwww.companypro.net

  nslookup: This command is used to query the Domain Name System (DNS) to obtain domain name or IP address mapping or for any other specific DNS record. www.companypro.net: This is the domain name you want to query to obtain its

  associated IP addresses.

  References:

  Using nslookup: nslookup Command Guide