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NEW QUESTION # 66
Hotspot Question
A help desk technician is working on a computer that is unable to resolve URLs in the browser.
The technician runs the ipconfig /allcommand and receives the following output:
You need to issue a command to view the network devices in the path from the computer to the server that resolves the host name.
Which command should you issue? Complete the command by selecting the correct option from each drop-down list.
Answer:
Explanation:
Explanation:
To view the network devices along the path, the correct utility is tracert. Since the server responsible for resolving host names is the DNS server, the destination should be the DNS server address shown in the output, 64.100.8.8.
NEW QUESTION # 67
A help desk technician is working on a computer that is unable to resolve URLs in the browser. The technician runs the ipconfig /all command and receives the following output.
You need to issue a command to view the network devices in the path from the computer to the server that resolves the host name.
Which command should you issue? Complete the command by selecting the correct option from each drop- down list.
Answer:
Explanation:
Explanation:
tracert 64.100.8.8
The Windows tracert utility identifies the Layer 3 network devices traversed by packets between a source computer and a specified destination.
The supplied ipconfig /all output identifies the following configuration:
* IPv4 address: 192.168.0.10
* Subnet mask: 255.255.255.0
* Default gateway: 192.168.0.1
* DHCP server: 192.168.10.1
* DNS server: 64.100.8.8
Because the computer cannot resolve URLs, the technician needs to investigate the network path to its configured Domain Name System (DNS) server.
The command is:
tracert 64.100.8.8
According to Cisco ' s Use the Traceroute Command on Operating Systems documentation, Windows tracert sends ICMP Echo Request packets with progressively increasing Time-to-Live (TTL) values.
Each responding intermediate router returns information that helps identify the route toward the destination.
Why the other options are incorrect:
ping: Tests IP reachability but does not display the complete sequence of intermediate routers.
nslookup: Queries DNS servers to resolve domain names but does not trace the network path.
netstat: Displays active network connections and protocol statistics.
The other destination choices represent the DHCP server, DNS suffix, and default gateway rather than the configured DNS server.
Therefore, tracert 64.100.8.8 is the correct command. A successful trace establishes IP-path reachability but does not independently verify that the DNS service is functioning.
References:
Cisco Certified Support Technician Networking (100-150) - Network Troubleshooting, Command-Line Diagnostic Tools.
Cisco - Use the Traceroute Command on Operating Systems.
Microsoft Learn - tracert Command Reference.
NEW QUESTION # 68
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.
Answer:
Explanation:
Explanation:
The correct matching of the security options to their characteristics is as follows:
* 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.
NEW QUESTION # 69
In the network shown in the following graphic, Switch1 is a Layer 2 switch.
PC-A sends a frame to PC-C. Switch1 does not have a mapping entry for the MAC address of PC-C. Which action does Switch1 take?
Answer: A
Explanation:
Understanding How Layer 2 Switches Handle Unknown MAC Addresses
Switches operate at Layer 2 (Data Link Layer) of the OSI model and maintain a MAC address table (CAM table) to forward frames efficiently.
* When a switch receives a frame, it checks its MAC address table to see if it knows the destination MAC address.
* If the destination MAC address is not in the table (meaning the switch does not know which port leads to PC-C), the switch follows the flooding behavior.
What Happens When Switch1 Receives a Frame from PC-A to PC-C?
* Switch1 checks its MAC table:
* The source MAC (PC-A) is recorded in the table on port G0/1.
* The destination MAC (PC-C) is not in the table.
* Switch1 does not know where PC-C is:
* It floods the frame out of all active ports except the port it was received on (G0/1).
* This means the frame is sent to:
* Switch2 (via G0/23)
* PC-B (via G0/2)
* Switch2 receives the frame and follows the same process:
* If Switch2 has PC-C's MAC in its table, it forwards the frame appropriately.
* If not, it floods the frame again until PC-C replies.
* Once PC-C responds, Switch1 and Switch2 learn its MAC address and update their tables.
Why Other Options Are Incorrect:
# A. Switch1 queries Switch2 for the MAC address of PC-C.
* Incorrect: Switches do not query other switches directly for MAC addresses. Instead, they rely on learning MAC addresses dynamically through frame forwarding.
# B. Switch1 drops the frame and sends an error message back to PC-A.
* Incorrect: Switches do not drop frames for unknown MAC addresses. Instead, they flood the frames out all ports except the incoming port.
# D. Switch1 sends an ARP request to obtain the MAC address of PC-C.
* Incorrect:
* ARP (Address Resolution Protocol) is only used to resolve IP addresses to MAC addresses.
* Since PC-A is sending a frame (Layer 2), not an IP packet (Layer 3), ARP is not involved here.
Conclusion
Since Switch1 does not know the destination MAC address, it floods the frame out all active ports except the port it was received on. This is the default behavior of Layer 2 switches when they encounter an unknown MAC address.
Thus, the correct answer is:# C. Switch1 floods the frame out all active ports except port G0/1.
References
* Cisco CCNA 200-301 Official Guide - MAC Address Table & Frame Forwarding
* RFC 894 - Standard for Ethernet Frame Forwarding
* Cisco Networking Essentials - Switch Flooding Behavior
NEW QUESTION # 70
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.
Answer:
Explanation:
Explanation:
A firewall can direct all web traffic to a specific IP address.
True: Firewalls can be configured to perform Network Address Translation (NAT) and port forwarding, which can direct all web traffic (typically on port 80 and 443) to a specific internal IP address.
A firewall can block traffic to specific ports on internal computers.
True: Firewalls can be configured with access control lists (ACLs) or rules to block traffic to specific ports on internal computers, enhancing security by restricting unwanted or harmful traffic.
A firewall can prevent specific apps from running on a computer.
False: Firewalls typically control traffic flow and do not prevent specific applications from running on a computer. Application control is usually managed by endpoint security software or application control systems.
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.
Reference: Understanding Firewalls: Firewall Capabilities
Network Security Best Practices: Network Security Guide
NEW QUESTION # 71
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