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| Section | Weight | Objectives |
|---|---|---|
| Addressing and Subnets | 20% | - IP Addressing
|
| Networking Standards and Concepts | 23% | - Network Fundamentals
|
| Endpoints and Media Types | 20% | - Network Devices and Media
|
| Network Infrastructures | 17% | - Infrastructure Components
|
| Diagnosing Problems | 20% | - Troubleshooting
|
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NEW QUESTION # 51
Examine the connections shown in the following image. Move the cable types on the right to the appropriate connection description on the left. You may use each cable type more than once or not at all.
Answer:
Explanation:
Explanation:
Based on the image description provided, here are the cable types matched with the appropriate connection descriptions:
Connects Switch S1 to Router R1 Gi0/0/1 interface Cable Type: = Straight-through UTP Cable Connects Router R2 Gi0/0/0 to Router R3 Gi0/0/0 via underground conduit Cable Type: = Fiber Optic Cable Connects Router R1 Gi0/0/0 to Router R2 Gi0/0/1 Cable Type: = Crossover UTP Cable Connects Switch S3 to Server0 network interface card Cable Type: = Straight-through UTP Cable The choices are based on standard networking practices where:
* Straight-through UTP cables are typically used to connect a switch to a router or a network interface card.
* Fiber optic cables are ideal for long-distance, high-speed data transmission, such as connections through an underground conduit.
* Crossover UTP cables are used to connect similar devices, such as router-to-router connections.
These matches are consistent with the color-coded cables in the image: green for switch connections, yellow for router-to-router connections within the same rack, and blue for inter-rack connections. The use of these cables follows the Ethernet cabling standards.
* Connects Switch S1 to Router R1 Gi0/0/1 interface:
* Cable Type: Straight-through UTP Cable
* Explanation: A straight-through UTP cable is typically used to connect different types of devices, such as a switch to a router.
* Connects Router R2 Gi0/0/0 to Router R3 Gi0/0/0 via underground conduit:
* Cable Type: Fiber Optic Cable
* Explanation: Fiber optic cables are used for long-distance connections, such as those through an underground conduit between buildings.
* Connects Router R1 Gi0/0/0 to Router R2 Gi0/0/1:
* Cable Type: Crossover UTP Cable
* Explanation: A crossover UTP cable is typically used to connect similar devices directly, such as router to router connections.
* Connects Switch S3 to Server0 network interface card:
* Cable Type: Straight-through UTP Cable
* Explanation: A straight-through UTP cable is typically used to connect a switch to an end device, such as a server.
* Straight-through UTP Cable: Used to connect different devices (e.g., switch to router, switch to server).
* Crossover UTP Cable: Used to connect similar devices directly (e.g., router to router, switch to switch).
* Fiber Optic Cable: Used for long-distance and high-speed connections, often between buildings or data centers.
References:
* Network Cable Types and Uses: Cisco Network Cables
* Understanding Ethernet Cabling: Ethernet Cable Guide
NEW QUESTION # 52
Which device protects the network by permitting or denying traffic based on IP address, port number, or application?
Answer: D
Explanation:
Firewall: A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It permits or denies traffic based on IP addresses, port numbers, or applications.
Access Point: This is a device that allows wireless devices to connect to a wired network using Wi-Fi.
It does not perform traffic filtering based on IP, port, or application.
VPN Gateway: This device allows for secure connections between networks over the internet, but it is not primarily used for traffic filtering based on IP, port, or application.
Intrusion Detection System (IDS): This device monitors network traffic for suspicious activity and policy violations, but it does not actively permit or deny traffic.
Reference: Understanding Firewalls: Firewall Basics
NEW QUESTION # 53
Hotspot Question
A help desk technician is working on a computer that is unable to resolve URLs in the browser.
The technician runs the ipconfig /allcommand and receives the following output:
You need to issue a command to view the network devices in the path from the computer to the server that resolves the host name.
Which command should you issue? Complete the command by selecting the correct option from each drop-down list.
Answer:
Explanation:
Explanation:
To view the network devices along the path, the correct utility is tracert. Since the server responsible for resolving host names is the DNS server, the destination should be the DNS server address shown in the output, 64.100.8.8.
NEW QUESTION # 54
Which type of connector should you use to terminate unshielded twisted pair cable?
Answer: D
Explanation:
Unshielded twisted pair Ethernet cable is terminated with an RJ-45 connector, which is the standard connector used for network copper cabling.
NEW QUESTION # 55
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: C
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 # 56
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