- Exam Code: 640-821
- Exam Name: Introduction to Cisco Networking Technologies
- Updated: Sep 15, 2026
- Q & A: 91 Questions and Answers
Cisco Introduction to Cisco Networking Technologies : 640-821
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Cisco 640-821 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Network Fundamentals | - LAN/WAN concepts - OSI and TCP/IP models - Network topologies and components |
| Topic 2: Routing Fundamentals | - Routing table concepts - Static routing basics |
| Topic 3: Network Security Basics | - Basic access control concepts - Device hardening overview |
| Topic 4: Cisco IOS Basics | - Show and debug commands - Basic device configuration - Command line interface (CLI) navigation |
| Topic 5: WAN Technologies | - WAN connection types - PPP and Frame Relay basics (legacy) |
| Topic 6: IP Addressing and Subnetting | - Basic subnetting calculations - IPv4 addressing structure - Subnet masks and CIDR notation |
| Topic 7: LAN Switching Technologies | - VLAN concepts - Trunking basics - Switch operation and MAC address table |
Cisco Introduction to Cisco Networking Technologies Sample Questions:
Question #1
Refer to the exhibit. Why was this message received?
- A. The login command has not been set on CON 0.
- B. No console password has been set.
- C. The login command has not been set on the VTY ports.
- D. No enable secret password has been set.
- E. No VTY password has been set.
- F. No enable password has been set.
Correct Answer: E 🗳️
Question #2
WAN data link encapsulation types include which of the following? (Choose two.)
- A. PPP
- B. DSL
- C. T1
- D. Frame Relay
- E. ISDN
Correct Answer: A,D 🗳️
Question #3
Refer to the output of the three router commands shown in the exhibit.A new technician has been told to add a new LAN to the company router. Why has the technician received the error message that is shown following the last command?
- A. The interface was already configured.
- B. The command was entered from the wrong prompt.
- C. The interface type does not exist on this router platform.
- D. The IOS software loaded on the router is outdated.
- E. The router does not support LAN interfaces that use Ethernet.
Correct Answer: C 🗳️
Question #4
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 neighbors
- B. show dhcp-config
- C. show ip rarp
- D. ping router_ip_address
- E. ping switch_ip_address
- F. show cdp neighbors detail
Correct Answer: F 🗳️
Question #5
Which Cisco IOS command identifies the system hardware and the IOS currently running on a router?
- A. show processes
- B. show version
- C. show startup-config
- D. show running-config
- E. show controllers
Correct Answer: B 🗳️
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