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| Section | Objectives |
|---|---|
| Topic 1: IP Services | - Network services
|
| Topic 2: Network Security Fundamentals | - Basic security concepts
|
| Topic 3: Network Access | - Ethernet and wireless technologies
|
| Topic 4: Networking Fundamentals | - OSI and TCP/IP models
|
| Topic 5: Network Automation and Programmability Basics | - Automation concepts
|
| Topic 6: IP Connectivity | - Routing fundamentals
|
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質問 # 65
At which OSI layer is the data stream broken up into segments that include source and destination port numbers?
正解：B
解説：
The Transport layer, Layer 4 of the Open Systems Interconnection (OSI) model, is responsible for end-to-end communication between applications running on network devices.
Its primary functions include data segmentation, transport-layer addressing, multiplexing, flow control, and, when TCP is used, reliable delivery.
The Transport layer uses two principal protocols:
Transmission Control Protocol (TCP): A connection-oriented protocol that divides application data into segments. TCP headers contain source and destination port numbers, sequence numbers, acknowledgment numbers, and other control information. TCP supports reliable, ordered delivery through acknowledgments and retransmission mechanisms.
User Datagram Protocol (UDP): A connectionless protocol that transmits datagrams with minimal overhead.
UDP headers contain source and destination port numbers, length, and checksum fields.
Port numbers identify the sending and receiving application endpoints. For example, HTTPS commonly uses TCP destination port 443.
Why the other options are incorrect:
B). Data Link: Layer 2 handles Ethernet frames, MAC addressing, and local network delivery.
C). Session: Layer 5 manages communication sessions between applications.
D). Network: Layer 3 handles logical IP addressing and routing packets between networks.
Therefore, Option A is correct because segmentation and transport-layer port addressing are Layer 4 functions.
References:
Cisco Certified Support Technician Networking (100-150) - Standards and Concepts, OSI Reference Model.
Cisco Networking Academy - Transport Layer Role and Services.
Cisco Networking Academy - TCP and UDP Header Fields, Segmentation and Port Numbers.
質問 # 66
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：B
解説：
For an unknown unicast destination, a Layer 2 switch floods the frame out all active ports except the one it was received on, ensuring delivery if the MAC is learned elsewhere.
質問 # 67
Which component of the AAA service security model provides identity verification?
正解：D
解説：
The AAA service security model consists of three components: Authentication, Authorization, and Accounting.
*Authentication: This is the process of verifying the identity of a user or device. It ensures that only legitimate users can access the network or service.
*Authorization: This determines what an authenticated user is allowed to do or access within the network.
*Auditing/Accounting: This component tracks the actions of the user, including what resources they access and what changes they make.
Thus, the correct answer is C. Authentication.
References :=
*Cisco AAA Overview
*Understanding AAA (Authentication, Authorization, and Accounting)
質問 # 68
How does low bandwidth affect network performance?
正解：A
質問 # 69
Computers in a small office are unable to access companypro.net. You run the ipconfig command on one of the computers. The results are shown in the exhibit.
You need to determine if you can reach the router.
Which command should you use? Complete the command by selecting the correct options from each drop- down lists.
正解：
解説：
Explanation:
To determine if you can reach the router, you should use the ping command followed by the IP address of the router. The ping command is a network utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer.
The Default Gateway in the ipconfig results is typically the router's IP address in a home or small office network. In this case, the Default Gateway is 192.168.0.1, which is the address you would ping to check connectivity to the router.
References :=
* How to Use the Ping Command
* Testing Network Connectivity with the Ping Command
To determine if you can reach the router, you should use the ping command with the IP address of the router.
* Command: ping
* Target: 192.168.0.1
So, the completed command is:
* ping 192.168.0.1
Step by Step Comprehensive and Detailed Explanation:
* ping: The ping command sends ICMP Echo Request messages to the target IP address and waits for an Echo Reply. It is commonly used to test the reachability of a network device.
* 192.168.0.1: This is the IP address of the default gateway (the router) as shown in the ipconfig output.
Pinging this address will help determine if the computer can communicate with the router.
References:
* Using the ping Command: ping Command Guide
質問 # 70
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