CCNA INTERVIEW QUESTIONS EXAM QUESTIONS

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CCNA INTERVIEW QUESTIONS EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -34 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is DHCP scope?

Answer:

A Dynamic Host Configuration Protocol (DHCP) scope is the consecutive range of possible IP addresses that the DHCP server can lease to clients on a subnet.

Question 2: What is the range of class B address?

Answer:

Class B range from 128.1.0.1 to 191.255.255.254 and supports 65,000 hosts on each of 16,000 networks.

Question 3: What is a protocol?

Answer:

A 'protocol' is a set of invisible computer rules that enable two devices to connect and transmit data to one another. Protocols determine how data is transmitted between computing devices and over networks.

Question 4: What are the four memories used in a CISCO router?

Answer:

ROM is read-only memory available on a router's processor board. The initial bootstrap software that runs on a Cisco router is usually stored in ROM. ROM also maintains instructions for Power-On Self-Test (POST) diagnostics.

Flash Memory is an electronically erasable and re-programmable memory chip. The flash memory contains the full operating system image (IOS, Internetwork Operating System). Flash memory retains content when a router is powered down or restarted.RAM is very fast memory that loses its information when the router is shutdown or restarted. On a router, RAM is used to hold running Cisco IOS Operating System, IOS system tables, and buffers RAM is also used to store routing tables. RAM provides temporary memory for the router configuration file of the router while the router is powered on.RAM stores running Cisco IOS Operating System, active program and operating instructions, the running configuration file, ARP cache, routing tables and buffered IP packets.NVRAM is used to store the startup configuration file. This is the configuration file that IOS reads when the router boots up. It is extremely fast memory and retains its content when the router is restarted.

Question 5: Where do we use cross and standard cable?

Answer:

Cross cables are used to connect to the same device, straight cables are used to connect different group devices.

Question 6: What is the difference between tracert and traceroute?

Answer:

Both tracert and traceroute do the same thing, on a router or switch you would use the command traceroute and on a pc you would use tracert.

Question 7: Explain different cable types?

Answer:

Straight cable - To connect different group devices (Switch - Router) Cross cable - To connect same group device (PC - PC, Switch - Switch) Rollover cable - To connect console port to computer

Question 8: What is the use of "Service Password Encryption"?

Answer:

The "service password encryption" command allows you to encrypt all passwords (including clear text) on your router so they cannot be viewed from your running-config.

Question 9: What is the difference between Private IP and Public IP?

Answer:

Public IP is used across internet and private IPs are used within the local LAN.

Question 10: Differentiate Logical Topology from Physical Topology?

Answer:

Physical topology is the network what we can see and logical topology is the network which data packets are sent from source to destination.

Question 11: What is Checksum?

Answer:

A simple error-detection scheme in which each transmitted message is accompanied by a numerical value based on the number of set bits in the message. The receiving station then applies he same formula to the message and checks to make sure the accompanying numerical value is the same. If not, the receiver can assume that the message has been garbled.Question 12: What are the different types of passwords used in securing a CISCO router?

Answer:

Console AUX VTY Enabled Password Enable Secret Question 13: Define and explain the five conversion steps of data encapsulation.

Answer:

Step 1 - Alphanumeric input from user converted data (Application/Presentation,Session) Step 2 - Data converted into segments (Transport) Step 3 - Segements converted into Packets or Datagrams and Network Header is added (Network) Step 4 - Packets or Datagrams are built into frames (Data Link) Step 5 - Frames are converted into bits (1s and 0s) for transmission (Physical)

Question 14: What is Redundancy?

Answer:

Network redundancy is a method in which a backup is provided for the primary device or route and thereby ensuring network will be available even the primary device or route become failed or unavailable.

Question 15: Explain the difference between a Router, Switch, and Hub?

Answer:

Hub: A hub is typically the least expensive, least intelligent, and least complicated of the three. Its job is very simple - anything that comes in one port is sent out to the others. A hub has a single collision domain and a single broadcast domain.

Switch: A switch is a device that filters and forwards packets between LAN segments. Switches operate at the data link layer (layer 2) and sometimes the network layer (layer 3) of the OSI Reference Model and therefore support any packet protocol. Switches have multiple collision domains and have a single broadcast domain.Router: A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP's network. Routers will not forward broadcast. If a router is present in a network, we may have at least TWO broadcast domains.

Question 16: Differentiate full-duplex from half-duplex?

Answer:

Full-duplex means that communication can occur in both directions at the same time. Half-duplex means communication can only occur in one direction at a time.Question 17: In configuring a router, what command must be used if you want to delete the configuration data that is stored in the NVRAM?

Answer:

#erase startup-config

Question 18: What is PoE?

Answer:

Power over Ethernet (PoE) describes the technology that pass electrical power along with data on Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as wireless access points or IP cameras.

Question 19: What is the range of class A address?

Answer:

Class A range from 1.0.0.1 to 126.255.255.254 and supports 16 million hosts on each of 127 networks.Question 20: What are the differences between static IP addressing and dynamic IP addressing?

Answer:

Dynamic IP addresses can change each time you connect to the Internet, while static IP addresses are reserved for you statically and do not change over time. In short, Dynamic IP addresses are provided by DHCP server and static IP addresses are given manually.