Networking Questions

 

আরো প্রশ্ন আপডেট হতে থাকবে 

    Questions on  "TELNET" :

1. TELNET stands for -------------------- 

Answer: TErminaL NETwork.

2. Why we use Telnet?

Answer: to access and manage remote devices by plain text format.

3. Telnet is an --------------------- protocol .

Answer: application layer 

4. Telnet Protocol provides  which? command-line interface / Graphical User Interface

Answer: command-line interface

5. ______ allows you to connect and login to a remote computer --> a) Telnet    b) FTP    c) HTTP     d) SMTP 

Ans: Telnet

6. Telnet is used for _______  

Answer: Remote Login

7. Which one of the following is not correct?
a) telnet is a general purpose client-server program
b) telnet lets user access an application on a remote computer
c) telnet can also be used for file transfer
d) telnet can be used for remote login

Answer: C)telnet can also be used for file transfer

8. Port Number of Telnet? Answer: 23

9. To access remote cisco device, what type of password is mandatory?

Answer: enable password

10. How to configure username (mushfiq) & password (!123!)

Answer: username  mushfiq  password  !123!

11. How to configure enable password as cisco123?

Answer: enable password cisco123

12. If you want to access 3 users simultaneously, what command should you use?

Answer: line  vty  0  2

13. Why we use "login  local" command in remote access configuration?

Answer:   We have authenticate users with Router's Username & Password which is stored in locally. That's why we will give this command

14. 

                    Questions on "SSH ":

1. Why you will use SSH instead of telnet?
Answer : if I want to secure my data, I have to use SSH instead of telnet. Because, through SSH, data will be encrypted while through telnet data remain plain text Format.

2. What is the port number of SSH?
Answer :22

3. What algorithm do SSH use?
Answer : RSA

4. What are requirements to create key of SSH to encrypt data?
Answer: a) Hostname               b) Domain Name

5. What's the command to generate key
Answer: encrypt key generate rsa

6. What is the command to login by   SSH from client machine? Assume - username - itbd &  SSH Server IP - 10.1.1.1
Answer: ssh -l  itbd 10.1.1.1

7. What does mean by l (L)?
Answer: l for login

8. If you want to access server only by SSH what command should you use in line mode?
Answer: transport input ssh

9. To enable SSH version 2 , what command should you use? And from which mode?
Answer:   Command : ip  ssh  version  2
                 Mode : Global Configuration Mode

10. How many bits are used for padding to generate version 1.99 or 2?
Answer : 7 bits

11. Default Key size of SSH?
Answer : 512

12. Minimum & Maximum number of bits of SSH key?
Answer: 360 & 4096

13. How many bits are required to generate SSH version 2?
Answer: 768

14. How many ways, we can login at SSH server from Windows?
Answer:(a) By PUTTY
              (b) By CMD

15. How can I see, how many users are connected by remotely?

Answer:  show users / who 

 16. How can I see, which IP and which user are connected to server?

Answer:  show users / who 

17. How can I clear the connected sessions?

Answer: clear line 2                  ; Here 2 is line number

18. How can you see the SSH version of your SSH-Server?

Answer: show ip ssh

19. The default timeout value is ------.

Answer: 120 seconds

20.ip ssh logging events

-This creates a log statement of an ssh attempt.

login on-success log

-This logs the username and IP of a successful login.

login on-failure log

-This logs the username and IP of a failed login attempt.

ip ssh authentication-retries 1

exec-timeout 1 0

ip ssh time-out 20

Questions on "DHCP ":

1. How DHCP works?
   Answer : DHCP works at DORA Process
        D - Discover
        O - Offer
        R - Request
        A - Acknowledgement

2.  What does packet Client initiates?
   Answer : Discover & Request

3. What does packets Server initiates?
   Answer : Offer & Ack

4. What are broadcast packets?
    Answer : Discover & Request

5. Port number of DHCP Server & Client
    Answer :   Server - 67
                     Client   - 68

6. Create a DHCP pool named - Wi-Fi-Clients
    Answer : ip dhcp pool Wi-Fi-Clients

7. What command should you use to configure gateway (10.1.1.1) of clients?
    Answer : default-router 10.1.1.1

8. What command should you use to configure DNS (1.1.1.1) of clients?
    Answer : dns-server  1.1.1.1

9. What command should you use to configure IP address & subnet mask (10.200.1.5/10) of clients?
    Answer : network 10.192.0.0. 255.192.0.0

10. From which mode, you will set DNS?
     Answer : DHCP mode  --->  (config-dhcp)#

11. How to remove a DHCP pool named --->  clients
     Answer : no ip dhcp pool clients

12. How to edit the gateway or DNS or network info of a dhcp pool?
     Answer :
    ==> You have to enter dhcp pool at first
    ==>  then, --> give right info again

13. Write the command for excluding IP address range 10th IP to 20th IP for the network of 10.200.20.60/10
Answer : ip dhcp exclude-address 10.192.0.10  10.255.255.20

14. What is the default Lease time of cisco router?

Answer: 24 Hours / 1 Day

15. The lease command takes up to three options: lease days [hours] [minutes], with hours and minutes being optional. You can specify a maximum period of 365 days, 23 hours and 59 minutes, and a minimum of 1 second. The default is one day. True / False?

Answer: True

15. How to define lease time (8 Days - 12 Hours - 59 Seconds) of cisco dhcp server and from which mode will you do this?

Answer: Within  DHCP pool -->  lease  8   12   59

17. Which command is used to see the Lease expiration & Client-ID/Hardware-Address?

Answer: show ip dhcp binding

18. What is Default-Router in DHCP-Server?

Answer: Client's Gateway