100-150 aktueller Test, Test VCE-Dumps für Cisco Certified Support Technician (CCST) Networking

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Cisco 100-150 Prüfungsplan:

ThemaEinzelheiten
Thema 1
  • Standards and Concepts: Covers foundational networking models, terminology, network types, cloud service models, and common application-layer protocols.
Thema 2
  • Addressing and Subnet Formats: Covers the distinction between public and private IP addressing, IPv4 subnetting, and IPv6 address and prefix formats.
Thema 3
  • Diagnosing Problems: Covers structured troubleshooting approaches, packet capture with Wireshark, common diagnostic commands, remote access methods, and basic Cisco show commands.
Thema 4
  • Infrastructure: Covers hands-on identification of Cisco hardware, physical cabling in network setups, port types, and the basic concepts behind routing and switching.

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Cisco Certified Support Technician (CCST) Networking 100-150 Prüfungsfragen mit Lösungen (Q71-Q76):

71. Frage
A user reports that a company website is not available. The help desk technician issues a tracert command to determine if the server hosting the website is reachable over the network.
The output of the command is shown as follows:

What can you tell from the command output?

Antwort: B

Begründung:
The tracert command output shows the path taken to reach the destination IP address, 192.168.1.10.
The command output indicates:
* Hops 1 and 2 are successfully reached.
* Hop 3 times out, meaning the router at hop 3 did not respond to the tracert request.
However, this does not necessarily indicate a problem with forwarding packets, as some routers may be configured to block or not respond to ICMP requests.
* Hops 4 and 5 are successfully reached, with hop 5 being the destination IP 192.168.1.10, indicating that the server is reachable.
Thus, the correct answer is C. The server with the address 192.168.1.10 is reachable over the network.
Reference: =
* Cisco Traceroute Command
* Understanding Traceroute
The tracert command output indicates that the server with the address 192.168.1.10 is reachable over the network. The asterisk (*) at hop 3 suggests that the probe sent to that hop did not return a response, which could be due to a variety of reasons such as a firewall blocking ICMP packets or the router at that hop being configured not to respond to ICMP requests. However, since the subsequent hops (4 and 5) are showing response times, it means that the packets are indeed getting through and the server is reachable12.
Reference: =
* How to Use Traceroute Command to Read Its Results
* How to Use the Tracert Command in Windows


72. Frage
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?

Antwort: D

Begründung:
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


73. Frage
A user at your company cannot connect to websites on the internet. However, they can connect to network resources on the company LAN.
You want to use the divide-and-conquer approach to troubleshoot the issue.
What should you do first?

Antwort: A

Begründung:
The divide-and-conquer method starts testing in the middle of the stack to quickly narrow the problem. Pinging the default gateway checks whether the user can reach beyond the local host to the local network boundary. Since the user can access LAN resources but not internet websites, this is the best first step to determine whether the issue is on the local side or farther upstream.


74. Frage
You need to connect a computer's network adapter to a switch using a 1000BASE-T cable.
Which connector should you use?

Antwort: B

Begründung:
*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


75. Frage
Which address is included in the 192.168.200.0/24 network?

Antwort: A

Begründung:
* 192.168.200.0/24 Network: This subnet includes all addresses from 192.168.200.0 to 192.168.200.255.
The /24 indicates a subnet mask of 255.255.255.0, which allows for 256 addresses.
* 192.168.199.13: This address is in the 192.168.199.0/24 subnet, not the 192.168.200.0/24 subnet.
* 192.168.200.13: This address is within the 192.168.200.0/24 subnet.
* 192.168.201.13: This address is in the 192.168.201.0/24 subnet, not the 192.168.200.0/24 subnet.
* 192.168.1.13: This address is in the 192.168.1.0/24 subnet, not the 192.168.200.0/24 subnet.
Reference: * Subnetting Guide: Subnetting Basics


76. Frage
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