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Cisco 640-821 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Network Fundamentals | 25% | - Network components: routers, switches, hubs, cables - OSI and TCP/IP model layers - Ethernet standards and operation - Network types: LAN, WAN, WLAN |
| Switching Fundamentals | 15% | - LAN switching concepts - VLAN basics and configuration - Switch operation and port configuration |
| IP Addressing and Subnetting | 25% | - ARP, ICMP, and DHCP operation - IPv4 addressing and classes - Private vs public IP addressing - Subnetting and VLSM |
| Routing and WAN Basics | 15% | - Common WAN technologies - Static and dynamic routing principles - Routing table overview - Basic network troubleshooting |
| Cisco IOS Basics | 20% | - Initial device configuration - IOS navigation and command-line interface - Managing configuration files - Password and security basics |
Cisco Introduction to Cisco Networking Technologies Sample Questions:
The internetwork shown in the diagram is experiencing network delays. On the basis of the information provided in the exhibit, what is the problem?
- A. The cable connecting Host A to Switch2 is too long.
- B. The cable between Router1 and Switch1 should be a crossover.
- C. The server is on a different subnet than router interface Fa0/0.
- D. The connection between Switch1 and Switch2 should be half-duplex.
- E. The cable between Switch1 and Switch2 should be straight-through.
Correct Answer: A 🗳️
Which of the following commands enables a network administrator to verify the application layer connectivity between source and destination?
- A. trace
- B. verify
- C. traceroute
- D. telnet
- E. ping
Correct Answer: D 🗳️
Refer to the exhibit. SwitchA receives the frame with the addressing shown. According to the command output also shown in the exhibit, how will SwitchA handle this frame?
- A. It will flood the frame out all ports.
- B. It will forward the frame out port Fa0/3 only.
- C. It will drop the frame.
- D. It will flood the frame out all ports except Fa0/3.
Correct Answer: D 🗳️
Refer to the graphic. A Cisco router and a Catalyst switch are connected as shown. The technician is working on a computer that is connected to the management console of the switch. In order to configure the default gateway for the switch, the technician needs to learn the IP address of the attached router interface. Which IOS command will provide this information in the absence of Layer 3 connectivity?
- A. show ip rarp
- B. ping router_ip_address
- C. ping switch_ip_address
- D. show cdp neighbors detail
- E. show ip neighbors
- F. show dhcp-config
Correct Answer: D 🗳️
Refer to the topology and MAC address table shown in the exhibit. Host A sends a data frame to host D.
What will the switch do when it receives the frame from host A?
- A. The switch will add the destination address of the frame to the MAC address table and forward the frame to host
- B. The switch will discard the frame and send an error message back to host A.
- C. The switch will add the source address and port to the MAC address table and forward the frame to host D.
- D. The switch will flood the frame out of all ports except for port Fa0/3.
Correct Answer: C 🗳️
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