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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Addressing and Subnet Formats | 20% | - IPv6 addressing and prefixes - Public vs private IP and NAT - IPv4 addressing and subnetting - Subnet mask and CIDR notation |
| Topic 2: Standards and Concepts | 20% | - Common network protocols - Bandwidth, throughput, and latency - OSI and TCP/IP models - Network topologies and types |
| Topic 3: Diagnosing Problems | 15% | - Troubleshooting methodology - Remote access methods (SSH, RDP, console) - Command-line utilities (ping, traceroute, nslookup) - Packet capture and analysis basics |
| Topic 4: Infrastructure | 20% | - Network device ports and status indicators - Switching concepts and VLANs - Routing concepts and default gateway - Wireless access points and SSIDs |
| Topic 5: Security | 10% | - Firewall and access control principles - CIA triad and AAA model - Common threats and vulnerabilities - Wireless security standards (WPA2/WPA3) |
| Topic 6: Endpoints and Media Types | 15% | - Connectivity verification tools - Wired, wireless, and cellular technologies - Network cables and connectors - Endpoint devices and operating systems |
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NEW QUESTION # 60
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.
Answer:
Explanation:
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.
tcp: 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.
Reference: Wireshark Filters: Wireshark Display Filters
NEW QUESTION # 61
Which wireless standard operates on both 2.4 GHz and 5 GHz frequencies and offers improved performance compared to older standards?
Answer: A
Explanation:
802.11n supports dual-band operation and uses technologies like MIMO to improve speed and range, making it more efficient than earlier wireless standards.
NEW QUESTION # 62
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 # 63
Which wireless security option uses a pre-shared key to authenticate clients?
Answer: C
Explanation:
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 connect1.
Reference: =
* 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.
Reference:
* Cisco Documentation on WPA2 Security: Cisco WPA2
* Understanding Wireless Security: Wireless Security Guide
NEW QUESTION # 64
Hotspot Question
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.
Answer:
Explanation:
Explanation:
This display filter captures all TCP traffic to and from port 7100, which is the port used by the HTTPS URL.
NEW QUESTION # 65
......
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