Cisco 640-821 - Introduction to Cisco Networking Technologies
- Exam Code: 640-821
- Exam Name: Introduction to Cisco Networking Technologies
- Updated: Oct 04, 2026
- Q & A: 91 Questions and Answers
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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IP Addressing and Subnetting | 25% | - ARP, ICMP, and DHCP operation - Subnetting and VLSM - IPv4 addressing and classes - Private vs public IP addressing |
| Topic 2: Network Fundamentals | 25% | - Network types: LAN, WAN, WLAN - OSI and TCP/IP model layers - Ethernet standards and operation - Network components: routers, switches, hubs, cables |
| Topic 3: Cisco IOS Basics | 20% | - Initial device configuration - Password and security basics - Managing configuration files - IOS navigation and command-line interface |
| Topic 4: Routing and WAN Basics | 15% | - Static and dynamic routing principles - Basic network troubleshooting - Common WAN technologies - Routing table overview |
| Topic 5: Switching Fundamentals | 15% | - Switch operation and port configuration - VLAN basics and configuration - LAN switching concepts |
Which Cisco IOS command identifies the system hardware and the IOS currently running on a router?
Correct Answer: A 🗳️
Which of the following commands displays the configurable parameters and statistics of all interfaces on a router?
Correct Answer: E 🗳️
Which types of cables are required to interconnect the devices shown in the graphic?
(Choose three.)
Correct Answer: A,C,F 🗳️
Refer to the exhibit. If host A sends an IP packet to host B, what will the OSI Layer 3 source address be in the packet when it reaches host B?
Correct Answer: E 🗳️
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