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Cisco 640-821 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Switching Fundamentals | 15% | - VLAN basics and configuration - Switch operation and port configuration - LAN switching concepts |
| 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% | - Basic network troubleshooting - Routing table overview - Static and dynamic routing principles - Common WAN technologies |
| Cisco IOS Basics | 20% | - Password and security basics - IOS navigation and command-line interface - Initial device configuration - Managing configuration files |
| Network Fundamentals | 25% | - Network types: LAN, WAN, WLAN - Network components: routers, switches, hubs, cables - OSI and TCP/IP model layers - Ethernet standards and operation |
Cisco Introduction to Cisco Networking Technologies Sample Questions:
What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?
- A. 14
- B. 15
- C. 16
- D. 30
- E. 32
- F. 31
Correct Answer: D 🗳️
If NVRAM lacks boot system commands, where does the router look for the Cisco IOS by default?
- A. ROM
- B. RAM
- C. Flash
- D. startup-config
- E. bootstrap
Correct Answer: C 🗳️
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 flood the frame out of all ports except for port Fa0/3.
- D. The switch will add the source address and port to the MAC address table and forward the frame to host D.
Correct Answer: D 🗳️
Refer to the graphic. What is the purpose of the two numbers shown following the exec- timeout command?
- A. If connected to the router by Telnet, input must be detected within one hour and 55 seconds or the connection will be closed.
- B. If no router activity has been detected in one hour and 55 minutes, the console will be locked out.
- C. If no commands have been typed in 55 seconds, the console connection will be closed.
- D. If no commands have been typed in one minute and 55 seconds, the console connection will be closed.
- E. If connected to the router by Telnet, input must be detected within one minute and 55 seconds or the connection will be closed.
Correct Answer: D 🗳️
