- Exam Code: 640-821
- Exam Name: Introduction to Cisco Networking Technologies
- Updated: Sep 15, 2026
- Q & A: 91 Questions and Answers
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| Section | Objectives |
|---|---|
| WAN Technologies | - PPP and Frame Relay basics (legacy) - WAN connection types |
| Routing Fundamentals | - Routing table concepts - Static routing basics |
| Network Fundamentals | - LAN/WAN concepts - OSI and TCP/IP models - Network topologies and components |
| IP Addressing and Subnetting | - IPv4 addressing structure - Basic subnetting calculations - Subnet masks and CIDR notation |
| LAN Switching Technologies | - Trunking basics - Switch operation and MAC address table - VLAN concepts |
| Cisco IOS Basics | - Command line interface (CLI) navigation - Show and debug commands - Basic device configuration |
| Network Security Basics | - Basic access control concepts - Device hardening overview |
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?
Correct Answer: B 🗳️
What is the purpose of using the copy flash tftp command on a router?
Correct Answer: B 🗳️
Which IP address is a private address?
Correct Answer: A 🗳️
A network administrator is having trouble with a remote router. The administrator connects to the router by Telnet and types a debug command, but no debug output appears on the screen. What command should the administrator type to view the debug output?
Correct Answer: D 🗳️
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