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| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Cisco Certified Support Technician (CCST) Networking |
| Exam Number: | 100-150 |
| Exam Price: | $125 USD |
| Real Exam Qty: | 40-50 |
| Certificate Validity Period: | 3 years |
| Exam Duration: | 50 minutes |
| Related Certifications: | Cisco Certified Support Technician (CCST) Networking CCNA |
| Passing Score: | Variable |
| Available Languages: | Chinese, Japanese, Portuguese, Arabic, French, Spanish, English |
| Exam Format: | Scenario-based Questions, Multiple Choice, Multiple Select |
| Sample Questions: | Cisco 100-150 Sample Questions |
| Exam Way: | Online or Pearson VUE test center |
| Pre Condition: | No formal prerequisites |
| Official Syllabus URL: | https://www.cisco.com/site/us/en/learn/training-certifications/exams/ccst-networking.html |
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NEW QUESTION # 84
Drag and Drop Question
Move the MFA factors from the list on the left to their correct examples on the right. You may use each factor once, more than once, or not at all.
Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
NEW QUESTION # 85
What information is contained in the MAC address table of a switch?
Answer: A
Explanation:
A switch MAC address table stores Layer 2 MAC addresses associated with switch ports for devices that have communicated through the switch, and it can also include static MAC addresses manually configured by an administrator.
NEW QUESTION # 86
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 # 87
A host is given the IP address 172.16.100.25 and the subnet mask 255.255.252.0.
What is the CIDR notation for this address?
Answer: C
Explanation:
The CIDR (Classless Inter-Domain Routing) notation for the subnet mask 255.255.252.0 is /22. This notation indicates that the first 22 bits of the IP address are used for network identification, and the remaining bits are used for host addresses within the network1.
Reference: =
* Subnet Cheat Sheet - 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network Reference
* Subnet Mask to CIDR Notation: The given subnet mask is 255.255.252.0.
To convert this to CIDR notation:
* Convert the subnet mask to binary: 11111111.11111111.11111100.00000000
* Count the number of consecutive 1s in the binary form: There are 22 ones.
* Therefore, the CIDR notation is /22.
Reference: * Understanding Subnetting and CIDR: Cisco CIDR Guide
NEW QUESTION # 88
Drag and Drop Question
Move the protocols on the left to their characteristics on the right. Each protocol may be used once, more than once, or not at all.
Note: You will receive credit for each correct answer.
Answer:
Explanation:
Explanation:
SFTP uses SSH for secure file transfer, so it supports SSH keys to verify the server and uses port 22 while providing confidentiality and integrity. TFTP is a lightweight file transfer protocol that uses UDP and port 69, making it suitable for simple transfers such as configuration backups and small file transfers within a LAN.
NEW QUESTION # 89
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