DHCP (Dynamic Host Configuration Protocol) port: 67
1)What is DHCP?
Ans: DHCP is a TCP/IP protocol that provides that provides way to dynamically allocated IP address to computers on the network.
2)Advantages of DHCP?
Ans: Centrally manages IP address allocation
Helps prevent address conflicts
Reduces administrative effort
Help converse IP addresses
3)What is SCOPE?
Ans: It is range of IP Address which is assigned to computers requesting for a Dynamic IP Address.
4)What is authorization?
Ans: It is Security precaution that ensures that only authorized DHCP Servers Can run in the network..
To avoid computers running illegal DHCP Servers in the network.
5) We’ve installed a new Windows-based DHCP server, however, the users do not seem to be getting DHCP leases off of it.
Ans: The server must be authorized first with the Active Directory.
6)How can you force the client to give up the dhcp lease if you have access to the client PC?
Ans: ipconfig /release
7)Cannot find DHCP Server
Ans: Cause: DHCP service is stopped or disable.
8)How to restore or move a DHCP into another computer
Ans:The DHCP database is contained in the Dhcp.mdb file located in the %SystemRoot%\System32\Dhcp folder. The DHCP server uses this file to record and store information concerning active leases and reservations. After you install a new DHCP, you can copy Dhcp.mdb into the above mentioned location.
9) Describe how the DHCP lease is obtained. It’s a four-step process consisting of
Ans(a) IP request, (b) IP offer, © IP selection and (d) acknowledgement.
DORA (D- Discover; O-offer; R- Request; A- Acknowledgement )
10) What is super scope?
Ans: the super scope is assigned a range of IP addresses that can be assigned to DHCP clients that reside on multiple subnets.
11) What is multicast scope?
Ans: the multicast scope contains a range of class:D multicast IP address ,and is used to assign these addresses to client computers that request them.
12) What is difference between scope and super scope?
Ans: A scope is assigned a range of IP address that can be assigned to DHCP clients that reside on a single subnet. Where the super scope is assigned a range of IP addresses that can be assigned to DHCP clients that reside on multiple subnets.
14) What is range of multicast scope?
15) I can’t seem to access the Internet, don’t have any access to the corporate network and on ipconfig my address is 169.254.*.*. What happened?
The 169.254.*.* netmask is assigned to Windows machines running 98/2000/XP if the DHCP server is not available. The name for the technology is APIPA (Automatic Private Internet Protocol Addressing).
16)What is the use of LDAP
It is lightweight directory access protocol
To perform replication
It is Internet communication protocol for TCP/IP network
It is used to query and update the active directory information
LDAP is actually the mechanism used to communicate with the Active Directory and performs basic read, write, and modify operations.
17)What are the problems that are generally come across DHCP
Unable to lease address from DHCP server
Unable to renew lease address
Troubleshoot
Verify the DHCP service started
DHCP service has been authorized in AD
Verifies the DHCP scope exists on the DHCP server
Verifies the DHCP scope is active
If scope con not be used to assign IP address until is activated
Physical connection to the n/w means n/w card, cable, and hub
18) How is it different than BOOTP or RARP?
DHCP is based on BOOTP and maintains some backward compatibility. The main difference is that BOOTP was designed for manual pre-configuration of the host information in a server database, while DHCP allows for dynamic allocation of network addresses and configurations to newly attached hosts. Additionally, DHCP allows for recovery and reallocation of network addresses through a leasing mechanism.
RARP is a protocol used by Sun and other vendors that allows a computer to find out its own IP number, which is one of the protocol parameters typically passed to the client system by DHCP or BOOTP. RARP doesn't support other parameters and using it, a server can only serve a single LAN. DHCP and BOOTP are designed so they can be routed.
19)We’ve installed a new Windows-based DHCP server, however, the users do not seem to be getting DHCP leases off of it. The server must be authorized first with the Active Directory.
20)How can you force the client to give up the dhcp lease if you have access to the client PC? ipconfig /release
21)What authentication options do Windows 2000 Servers have for remote clients? PAP, SPAP, CHAP, MS-CHAP and EAP.
2)What are the networking protocol options for the Windows clients if for some reason you do not want to use TCP/IP? NWLink (Novell), NetBEUI, AppleTalk (Apple).
3) What is binding order? The order by which the network protocols are used for client-server communications. The most frequently used protocols should be at the top.
4)How do cryptography-based keys ensure the validity of data transferred across the network? Each IP packet is assigned a checksum, so if the checksums do not match on both receiving and transmitting ends, the data was modified or corrupted.
5)Should we deploy IPSEC-based security or certificate-based security? They are really two different technologies. IPSec secures the TCP/IP communication and protects the integrity of the packets. Certificate-based security ensures the validity of authenticated clients and servers.
1 comment:
Good Article.
DHCP Interview Question Answers
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