CCNA
Interview Questions
You'll Most Likely Be Asked
Job Interview Questions Series
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CCNA Interview Questions You'll Most Likely Be Asked
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1. TCP/IP and OSI Networking Models
8. Cisco LAN Switches Operation and Configuration
10. IP Addressing and Subnetting
11. Cisco Routers Operation and Configuration
12. Routing Protocols Concepts and Troubleshooting
13. Ethernet Virtual LANs (VLAN)
15. Troubleshooting LAN Switching
17. VLSM and Route Summarization
18. Control Network Traffic with Access Control Lists (ACLs)
21. Point-To-Point WAN Links and Protocols
22. Frame-Relay Configuration and Troubleshooting
23. Virtual Private Networks (VPN)
24. Network Address Translation (NAT)
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CCNA Interview Questions
Review these typical interview questions and think about how you would answer them. Read the answers listed; you will find best possible answers along with strategies and suggestions.
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TCP/IP and OSI Networking Models
1: What is OSI reference model “network” layer?
Answer:
It is layer 3 of the OSI reference model that defines logical addressing, routing and path determination. Examples of the protocols working at this layer are IP and IPX.
2: Which of the below are Transport layer protocols?
a) TCP
b) HTTP
c) IP
d) UDP
Answer:
a. TCP, d. HTTP
3: In networking terminology, what is “data encapsulation”?
Answer:
It is the process of putting headers and trailers around the data. Each layer encapsulates the upper layer’s data into a new header and trailer. This process is repeated until reaching layer 1 which is responsible for transmitting the data over the transmission medium.
4: In which OSI reference model layer does HTTP operate?
a) Transport layer
b) Network layer
c) Application layer
d) Physical layer
Answer
c. Application layer
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5: What is CSMA/CD and how does it work?
Answer:
CSMA/CD is a set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously. A transmitting data station that detects another signal while transmitting a frame, stops transmitting that frame, transmits a jam signal, and then waits for a random time interval before trying to resend the frame.
6: Which connector type is used in Ethernet cables?
a) RJ11
b) RJ12
c) RJ55
d) RJ45
Answer:
d. RJ45
7: What is broadcast MAC address and what is its value?
Answer:
The broadcast MAC address is a type of layer 2 address that is used to deliver data to all devices in the same broadcast domain of the sender. The source sends only one frame on the network and the switch replicates it to all ports in the same broadcast domain of the source. The broadcast MAC address has a value of FFFF.FFFF.FFFF.
8: Describe “twisted” pair cables and mention why they are twisted.
Answer:
Ethernet cables contain 8 wires in 4 pairs groups. Each pair is twisted so that the magnetic field created by one wire cancels out the magnetic field created by the other wire. This enhances performance and decreases transmission noise.
9: Describe how you can make an Ethernet cross-over cable.
Answer:
Ethernet cross-over cable is created by connecting Pins 1 and 2 on one side of the cable to pins 3 and 6 on the other side. The other pins’ connectivity doesn’t matter as the network device uses only 4 wires of the 8 to send and receive data.
10: What typical cable type do you use to connect two switches together?
a) Straight-through cable
b) Roll-over cable
c) Console cable
d) Cross-over cable
Answer:
d. Cross-over cable
11: What is the maximum cable length in Fast Ethernet (IEEE 802.3u) standard?
a) 100m
b) 200m
c) 50m
d) 500m
Answer:
a. 100m
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