Cisco 640-821 - Introduction to Cisco Networking Technologies
Updated: Oct 23, 2026
Q & A: 91 Questions and Answers
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Updated: Oct 23, 2026
Q & A: 91 Questions and Answers
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| Section | Objectives |
|---|---|
| Topic 1: WAN Technologies | - WAN connection types - PPP and Frame Relay basics (legacy) |
| Topic 2: Cisco IOS Basics | - Show and debug commands - Command line interface (CLI) navigation - Basic device configuration |
| Topic 3: Network Security Basics | - Device hardening overview - Basic access control concepts |
| Topic 4: Network Fundamentals | - LAN/WAN concepts - Network topologies and components - OSI and TCP/IP models |
| Topic 5: IP Addressing and Subnetting | - Subnet masks and CIDR notation - IPv4 addressing structure - Basic subnetting calculations |
| Topic 6: Routing Fundamentals | - Static routing basics - Routing table concepts |
| Topic 7: LAN Switching Technologies | - Trunking basics - VLAN concepts - Switch operation and MAC address table |
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?
Correct Answer: A 🗳️
A network associate needs to configure a router by connecting a remote computer to the router through the router auxiliary port. Which two statements describe the hardware required to make the connection to the router? (Choose two.)
Correct Answer: C,D 🗳️
Which command can be used to determine the type of cable attached to the Serial 0/0 interface on a router?
Correct Answer: D 🗳️
What data structure is described in the graphic?
Correct Answer: B 🗳️
A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
Correct Answer: E 🗳️
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