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Cisco CCNA 640-821

640-821

Exam Code: 640-821

Exam Name: Introduction to Cisco Networking Technologies

Updated: Sep 06, 2026

Q & A: 91 Questions and Answers

640-821 Free Demo download:

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Cisco 640-821 Exam Syllabus Topics:

SectionObjectives
Topic 1: Network Security Basics- Device hardening overview
- Basic access control concepts
Topic 2: Routing Fundamentals- Routing table concepts
- Static routing basics
Topic 3: IP Addressing and Subnetting- Basic subnetting calculations
- IPv4 addressing structure
- Subnet masks and CIDR notation
Topic 4: Network Fundamentals- OSI and TCP/IP models
- LAN/WAN concepts
- Network topologies and components
Topic 5: Cisco IOS Basics- Command line interface (CLI) navigation
- Basic device configuration
- Show and debug commands
Topic 6: LAN Switching Technologies- Trunking basics
- VLAN concepts
- Switch operation and MAC address table
Topic 7: WAN Technologies- WAN connection types
- PPP and Frame Relay basics (legacy)

Cisco Introduction to Cisco Networking Technologies Sample Questions:

Question 1

Which OSI layer header contains the address of a destination host that is on another network?

A. physical
B. data link
C. session
D. application
E. transport
F. network


Question 2

Which command can be used to determine the type of cable attached to the Serial 0/0 interface on a router?

A. show ip interface
B. show running-config
C. show interfaces serial 0/0
D. show version
E. show controllers serial 0/0
F. show line serial 0/0


Question 3

What is the subnet address for the IP address 172.19.20.23/28?

A. 172.19.20.0
B. 172.19.20.20
C. 172.19.20.32
D. 172.19.20.15
E. 172.19.20.16


Question 4

A network administrator is connecting PC hosts A and B directly through their Ethernet interfaces as shown in the graphic. Ping attempts between the hosts are unsuccessful.
What can be done to provide connectivity between the hosts? (Choose two.)

A. A rollover cable should be used in place of the straight-through cable
B. A crossover cable should be used in place of the straight-through cable.
C. The subnet masks should be set to 255.255.255.0.
D. The hosts must be reconfigured to use private IP addresses for direct connections of this type.
E. The subnet masks should be set to 255.255.255.192.
F. A default gateway needs to be set on each host.


Question 5

A network administrator cannot get a router serial interface to become active. The administrator suspects that the problem may be the cable attached to the interface. The administrator is not at the same physical location as the router. Which Cisco IOS command allows the administrator to check the serial 0/0 cabling type?

A. show startup-config
B. show running-config
C. show interfaces serial 0/0
D. show version
E. show controllers serial 0/0


Solutions:

Question 1
Answer: F
Question 2
Answer: E
Question 3
Answer: E
Question 4
Answer: B,C
Question 5
Answer: E

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