CISCO RELIABLE 100-150 EXAM ONLINE EXAM PASS CERTIFY | EXAMCOLLECTION 100-150 DUMPS

Cisco Reliable 100-150 Exam Online Exam Pass Certify | Examcollection 100-150 Dumps

Cisco Reliable 100-150 Exam Online Exam Pass Certify | Examcollection 100-150 Dumps

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Cisco Certified Support Technician (CCST) Networking Sample Questions (Q16-Q21):

NEW QUESTION # 16
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.
* 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


NEW QUESTION # 17
A Cisco switch is not accessible from the network. You need to view its running configuration.
Which out-of-band method can you use to access it?

  • A. Telnet
  • B. Console
  • C. SSH
  • D. SNMP

Answer: B

Explanation:

Out-of-band management
When a Cisco switch is not accessible from the network, the recommended out-of-band method to access its running configuration is through the console port. Out-of-band management involves accessing the network device through a dedicated management channel that is not part of the data network. The console port provides direct access to the switch's Command Line Interface (CLI) without using the network, which is essential when the switch cannot be accessed remotely via the network12.
References :=
* Out-of-band (OOB) network interface configuration guidelines
* Out of band management configuration


NEW QUESTION # 18
Examine the following output:

Which two conclusions can you make from the output of the tracert command? Note: You will receive partial credit for each correct answer. (Choose 2.)

  • A. The trace failed after the fourth hop.
  • B. The routers at hops 5 and 6 are offline.
  • C. The IPv6 address associated with the www.cisco.com server is 2600:1408: c400: 38d: : b33.
  • D. The device sending the trace has IPv6 address 2600:1408:c400:38d :: b33.
  • E. The trace successfully reached the www.cisco.com server.

Answer: C,E

Explanation:
* Statement A: "The trace successfully reached the www.cisco.com server." This is true as indicated by the "Trace complete" message at the end, showing that the trace has reached its destination.
* Statement C: "The IPv6 address associated with the www.cisco.com server is
2600:1408:c400:38d::b33." This is true because the final hop in the trace, which is the destination, has this IPv6 address.
* Statement B: "The trace failed after the fourth hop." This is incorrect as the trace continues beyond the fourth hop, despite some intermediate timeouts.
* Statement D: "The routers at hops 5 and 6 are offline." This is not necessarily true. The routers might be configured to not respond to traceroute requests.
* Statement E: "The device sending the trace has IPv6 address 2600:1408:c400:38d::b33." This is incorrect; this address belongs to the destination server, not the sender.
Reference: * Understanding Traceroute: Traceroute Guide


NEW QUESTION # 19
Which information is included in the header of a UDP segment?

  • A. MAC addresses
  • B. Sequence numbers
  • C. IP addresses
  • D. Port numbers

Answer: D

Explanation:
The header of a UDP (User Datagram Protocol) segment includes port numbers. Specifically, it contains the source port number and the destination port number, which are used to identify the sending and receiving applications. UDP headers do not include IP addresses or MAC addresses, as those are part of the IP and Ethernet frame headers, respectively. Additionally, UDP does not use sequence numbers, which are a feature of TCP (Transmission Control Protocol) for ensuring reliable delivery of data segments1.
Reference: =
Segmentation Explained with TCP and UDP Header
User Datagram Protocol (UDP) - GeeksforGeeks
Which three fields are used in a UDP segment header
UDP Header: The header of a UDP segment includes the following key fields:
Source Port: The port number of the sending application.
Destination Port: The port number of the receiving application.
Length: The length of the UDP header and data.
Checksum: Used for error-checking the header and data.
IP Addresses: These are included in the IP header, not the UDP header.
Sequence Numbers: These are part of the TCP header, not UDP.
MAC Addresses: These are part of the Ethernet frame header and are not included in the UDP header.
Reference: RFC 768 - User Datagram Protocol: RFC 768
Cisco Guide on UDP: Cisco UDP Guide


NEW QUESTION # 20
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?

  • A. Switch1 queries Switch2 for the MAC address of PC-C.
  • B. Switch1 floods the frame out all active ports except port G0/1.
  • C. Switch1 sends an ARP request to obtain the MAC address of PC-C.
  • D. Switch1 drops the frame and sends an error message back to PC-A.

Answer: B

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 # 21
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