Network

Q1.What is router?

Ans. Router is a layer 3 device in a network used to transfer data b/w no. of host with the help of IP address it forms a route table to forward the packet.

Q2. Role of active directory?

Ans. Active Directory is a hierarchical database; it contains info about all the objects like users, computers, groups, printers of forest. Provides information services to its clients.

Q3. How will you check if router goes down?

Ans. Every router has a LED to indicate whether the connection to the internet is healthy/not.
If the connection is healthy i.e. smooth n going.... then the LED glows Green
if the connection is unhealthy i.e. the router goes down / there is some disruption in the n/w path. Then the LED glows Amber (Yellowish Orange)

Q4. What is the advantage of sub-netting an IP address?

Ans. Subnetting is a best technique for network. When we split a large n/w into small n/w it is called Subnetting. With the help of subnetting we can reduce the N/w congestion. Because all computer broadcast for transmission. So we break huge network into small network and now broadcasting will be done only small network with the help of subnetting we can save money. Because we buy an single IP address from ISP and increase the IP address from Subnetting. That's why we can say that subnetting is best tool for increase bandwidth and save the money.

Q5. What is static ip and dynamic IP?

Ans. static IP address- administratively assignments of IP address.
Dynamic - assigning the IP address dynamically by using DHCP.

Q6. Which intermediary device regenerates data signals?

Ans. basically when our signal is weak (on a network) then we should have a repeater device. This device used to regenerate the weak signal.

Q7. What is picking and packing in computer networking?

Ans. As far as I know this term is used for items that needs to be picked from various locations in a warehouse whenever a customer fills the shopping cart and & submits the list for purchase.

Q8. What are port numbers for telnet, ftp, http and rpc?

Ans. Port is registered with IANA for the application = Official Port is not registered with IANA for the application = Unofficial Telnet = port - 23(Official) FTP = port - 20(Data Tx), 21(Command), 22(S...

Telent: 23
FTP: 22/21
HTTP: 80
RPC: 135

Q9. IIS server backup?

Ans. It’s too simply to IIS backup. Take the system state backup in that only IIS will be consider, if the server is IIS.

Q10. You want to connect a cable modem to a switch. Which cable would you use?

Ans. Straight cable.
If we use different devices we can use straight cable.
If we use same devices we can use cross cable

Q11. What is difference between ipv4 & ipv6?

Ans. IPv4 means Internet Protocol version 4, whereas IPv6 means Internet Protocol version 6.
IPv4 is 32 bits IP address that we use commonly; it can be 192.168.8.1, 10.3.4.5 or other 32 bits IP addresses. IPv4 can support up to 232 addresses, however the 32 bits IPv4 addresses are finishing to be used in near future, so IPv6 is developed as a replacement.
IPv6 is 128 bits, can support up to 2128 addresses to fulfill future needs with better security and network related features. Here are some examples of IPv6 address:
1050:0:0:0:5:600:300c:326b
ff06::c3
0:0:0:0:0:0:192.1.56.10
The most important difference is that it has a larger address space. IPv6 uses 128 bits, instead of the 32 bits used in an IPv4 address.

Q12. How does Dora process works in DHCP?

Ans. DORA stands for Discover Offer Request Ack
When there is request been sent from the client and there should be a response should be sent from the server, So the process discovering the request been sent from which client and send the Ack to the client from to server that the request is been accepted
This is was DORA concept in DHCP :)

Q13. Can infrastructure master and Global catalog be on same domain?

Ans. No because Infrastructure master performs its task by comparing its state against the state of a GC      and updates other DCs in the same domain based on the outcome. Effectively, the update would never take place since no differences would be detected.

Q14. Mac address and ip address?

Ans. This is because different types of devices use different ways of communicating to hosts. Routers for example use the IP or logical address whereas level 2 switches and older HUBS use the MAC address to communicate.

Q15. Internet connection issue?

Ans. If someone finds that their internet connectivity is down, how would you fix the problem: If someone is using a laptop they may have accidentally turned their wifi connection off This is fixed by:
Looking for the wifi connection button on the top row of the keyboard. It looks similar to the letter A surrounded by parenthesis. Push it to turn the wifi connection back on.

Q16.A user can log on to the network but has no internet connection? Explain what could be the problem.

Ans. First check the user account's membership in AD
if account is allowed to access internet check proxy settings if proxy settings are all ok update the group policy of the client machine and rerun the login script if does not work reinstall the client software.