- Exam Code: 640-821
- Exam Name: Introduction to Cisco Networking Technologies
- Updated: Jul 27, 2026
- Q & A: 91 Questions and Answers
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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Fundamentals | 25% | - Network types: LAN, WAN, WLAN - OSI and TCP/IP model layers - Network components: routers, switches, hubs, cables - Ethernet standards and operation |
| Topic 2: Cisco IOS Basics | 20% | - Initial device configuration - Password and security basics - IOS navigation and command-line interface - Managing configuration files |
| Topic 3: Routing and WAN Basics | 15% | - Common WAN technologies - Routing table overview - Static and dynamic routing principles - Basic network troubleshooting |
| Topic 4: Switching Fundamentals | 15% | - LAN switching concepts - VLAN basics and configuration - Switch operation and port configuration |
| Topic 5: IP Addressing and Subnetting | 25% | - Private vs public IP addressing - IPv4 addressing and classes - ARP, ICMP, and DHCP operation - Subnetting and VLSM |
1. Refer to the graphic. Although the console password was set to "cisco", it displays in the router configuration as shown. What command caused the password to be stored like this?
A) Router(config)# encrypt password
B) Router(config)# service password-encryption
C) Router(config)# password-encryption md 7
D) Router(config-line)# exec-timeout 1 55
2. HOTSPOT
lab



3. What two commands can be used to view the amount of memory that is used to hold the router IOS? (Choose two.)
A) Router# show flash
B) Router# show memory
C) Router# show running-config
D) Router# show version
E) Router# show flash memory
4. DRAG DROP
drag drop
5. HOTSPOT
lab




Solutions:
| Question # 1 Answer: B | Question # 2 Answer: Only visible for members | Question # 3 Answer: A,D | Question # 4 Answer: Only visible for members | Question # 5 Answer: Only visible for members |
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