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| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Cisco Certified Support Technician (CCST) Networking |
| Exam Number: | 100-150 |
| Related Certifications: | Cisco Certified Support Technician (CCST) Networking CCNA |
| Exam Format: | Scenario-based Questions, Multiple Select, Multiple Choice |
| Exam Duration: | 50 minutes |
| Passing Score: | Variable |
| Available Languages: | Spanish, Chinese, Arabic, English, Portuguese, Japanese, French |
| Certificate Validity Period: | 3 years |
| Exam Price: | $125 USD |
| Real Exam Qty: | 40-50 |
| 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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質問 # 53
How is the following IP address written when using CIDR notation?
Address: 192.168.0.16
Subnet Mask: 255.255.255.240
正解：C
解説：
The subnet mask 255.255.255.240 contains 28 network bits, so the address is written in CIDR notation as 192.168.0.16/28.
質問 # 54
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?
正解：A
解説：
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
質問 # 55
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?
正解：C
解説：
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
質問 # 56
Drag and Drop Question
Move each network category on the left to its correct definition on the right.
正解：
解説：
Explanation:
A LAN covers a limited local area such as a home, office, or small group of buildings. A WAN connects networks across large geographic distances using provider links or tunnels. A PAN connects personal devices within a short range, typically around 10 meters.
質問 # 57
You need to connect a computer's network adapter to a switch using a 1000BASE-T cable.
Which connector should you use?
正解：D
解説：
*1000BASE-T Cable: This refers to Gigabit Ethernet over twisted-pair cables (Cat 5e or higher).
*Connector: RJ-45 connectors are used for Ethernet cables, including those used for 1000BASE-T.
*Coax: Used for cable TV and older Ethernet standards like 10BASE2.
*RJ-11: Used for telephone connections.
*OS2 LC: Used for fiber optic connections.
References:
*Ethernet Standards and Cables: Ethernet Cable Guide
質問 # 58
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