...Javier Dominguez DNS & DHCP DNS allows people to use meaningful names, such as http://www.yahoo.com.proxy.itt-tech.edu, to find Internet-based resources. In this way, DNS has allowed users from a wide range of educational backgrounds to makes use of the Internet. DNS eliminated the need to manually remember IP addresses and replaced that system with human-readable names instead; DNS was invented to solve the logistical problems that arose because too many hosts were on the Internet to be able to keep track of using a manual list of addresses. In other words DNS function is to translate names to IP addresses and vice versa, that way instead of remembering a long IP address you can just type a name that is easy to remember. http://library.books24x7.com.proxy.itt-tech.edu/assetviewer.aspx?bookid=12254&chunkid=309282908&rowid=24 With the increasing number and different types of devices attaching to the network, managing IP addresses efficiently and accurately introduces many challenges for network operators of large-scale networks, including service providers and enterprises. Both Domain Name System (DNS) and Dynamic Host Configuration Protocol (DHCP) are mission-critical capabilities that need to be able to scale, and many service providers have created dynamic service delivery based on DNS to achieve service quality and deliver advantages. However, if DNS fails, then the Internet fails. Assigning a unique address to every device connecting to the network has...
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...DNS and DHCP overhead DNS or Domain Name System is a service used by computers to translate human-friendly names into IP addresses. It’s like a phone book for the internet. DHCP or Dynamic Host Configuration Protocol is a networking protocol that configures devices that connect to a network can communicate on that network; it manages things like IP addresses, default routes and DNS server addresses. By using DNS and DHCP in concert, a site can happily grow to hundreds or thousands of nodes servers, desktop systems, laptops, printers, whatever, with minimal network/systems administrator effort. Both DNS and DHCP are essential tools in the network administrator's toolkit for managing all the IP devices on a corporate network. The more devices that require an IP address the more likely you are going to need DHCP and DNS to help maintain the IP addresses. The advantage of using dynamic IP addresses is that you avoid many common problems. For example, if you manually configure IP addresses, you must keep track of which addresses you have and haven't assigned, and to whom. If you accidentally assign two people the same address, of if a user monkeys around with his or her address, you can run into network problems that can be very hard to resolve. Furthermore, in many organizations, it's common practice to constantly move computers all over the building or between buildings. In such situations, if you were using static IP addresses, you'd be forced to change IP addresses to an...
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...DNS and DHCP, how they make your life easier DNS stands for domain name system, and DHCP stands for dynamic host configuration protocol. Most of the time they are used in conjunction with connecting to a network, though they are not reliant on each other, nor do you have to use either one to connect to your network. They just make the job of setting a network up that much easier, but you can still do everything manually if you choose to do so, it just won’t be anywhere near efficient. DHCP allows assigning IP addresses to computers on a network automatically instead of having to logon to each individual computer and set the addresses yourself, as well as keeping track of the addresses you have already assigned. DHCP takes place on your router, you connect your computer to the router, either wired or wireless, and the router automatically assigns an available IP address to the device and it keeps track of this so no two devices that connect to the router are given the same IP. If two devices with the same IP try communicate with the router, the device that connected first will work; the second device will act as if it has no connection. If the first device is shut down, the second device will then start to work, the network connection may need to be reset first though on the second piece of equipment. Two devices just can’t share the same IP address at the same exact time. A DNS server takes the domain name of a website and translates it into an IP address which a computer...
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...Configuring and Maintaining the DHCP and DNS Server Roles Unit 2 Jovanny Avelino Client-Server II NT1330 Professor Arthur VIII Due: 3/21/2016 DHCP: DHCP is a standard protocol that make TCP/IP network configuration much easier for the administrator by dynamically assigning IP addressing and providing additional configuration information to DHCP clients automatically. DHCP configuration information can centrally manage all information can stored in one single location. Because DHCP is dynamically host configuration can eliminate the prose of manually configured all client IP address. Other benefit of DHCP is the opportunity of set up the subnet mask, default gateway and the DNS IP address. And give the flexibility of change IP address when is need it. The DHCP server have different ways to communicate with the client: * DHCPDISCOVER: is when the client send a broadcast to find a DHCP server. * DHCPOFFER: soon and he server find the client than the server respond, and send a offer. * DHCPREQUEST: is when the client respond to the offered from the DHCP server. * DHCPDECLIEN: mean that the client declined the DHCP server offered. * DHCPACK: is the way the DHCP server confirm the IP address and configuration parameters. * DHCPRELEASE: is the way the client cancel the IP address lease. * DHCPINFORM: is a message send by the client asking for additional configuration parameters, also use for detect unauthorized DHCP servers. Using those terminology...
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...Name System (DNS) servers provide name resolution for network clients. DNS maintains among other things information that links a computer's fully qualified domain name (FQDN) to its assigned IP address(es). While DHCP provides a powerful mechanism for automatically configuring client IP addresses, until recently DHCP did not notify the DNS service to update the DNS records on the client; specifically, updating the client name to an IP address, and IP address to name mappings maintained by a DNS server. Without a way for DHCP to interact with DNS, the information maintained by DNS for a DHCP client may be incorrect. For example, a client may acquire its IP address from a DHCP server, but the DNS records would not reflect the IP address acquired nor provide a mapping from the new IP address to the computer name (FQDN). In Windows 2000, DHCP servers and clients can register with DNS to provide this update service if the DNS server supports DNS with dynamic updates. The Windows 2000 DNS service supports dynamic updates. A Windows 2000 DHCP server can register with a DNS server and update pointer and address (A) resource records on behalf of its DHCP-enabled clients using the DNS dynamic update protocol. The ability to register both A and PTR type records lets a DHCP server act as a proxy for clients using Microsoft Windows 95 and Windows NT 4.0 for the purpose of DNS registration. DHCP servers can differentiate between Windows 2000 and other clients. An additional DHCP option code...
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...Course Objectives and Learning Outcomes In this assignment, you will explain the function of DHCP and DNS. Assignment Requirements Write a 1-page report summarizing IT-management overhead in reference to DHCP and DNS. In your report, address IT-management overhead in reference to DNS and DHCP, with the following question in mind: 1. How many hosts does it take to justify the time and effort to setup a centrally managed solution for name resolution and address allocation? (In other words, is it worth setting up DHCP for two computers? 5? 25?) Consider both MS Windows Server DNS and DHCP as well as other, special use devices where DNS or DHCP may be built-in. 2. At what point should DNS or DHCP be considered a priority and require some level of redundancy? 3. Should servers use DHCP? Submission Requirements Maximum 1 page, Microsoft Word, double-spaced, 12 pt. font 1. How many hosts does it take to justify the time and effort to setup a centrally managed solution for name resolution and address allocation? (In other words, is it worth setting up DHCP for two computers? 5? 25?) Consider both MS Windows Server DNS and DHCP as well as other, special use devices where DNS or DHCP may be built-in. I believe one host is enough. In fact, if the host has a functioning network interface which is connected to a network chances are it is managed by DHCP uses DNS for name resolution. Although most end users don’t know or understand the how their computer...
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...In this Exercise, you will explain IP addres components, contrast classful and classless IP addressing, and explain the function of DNS and DHCP. Assignment Requirements Respond to the following scenario with design considerations and recommendations: You are a IT Administrator for a newly founded company and have been tasked with designing an IP addressing scheme and a plan for allocation and management of IP addresses. The company will currently have a single, physical location with approximately 145 hosts (computers, printers, etc.) IT plans should accommodate 50% growth within the next two years. At a minimum, address these specific questions, in addition to any other concerns/considerations. 1. What subnet range/s should be used 2. Should IP addresses be dynamically or statically assigned. 3. Should one or more network/subnets be used? 4. If DHCP is used, should a router,firewall or Windows Server be utilized and why? Respond in detail. justifying your recommendations. 1-2 pages I find that the IP address components as being the “core” of the IP addresses. Nothing would work without them. They are like the postal address of a home or office building. Every page you see on the internet has a (postal) IP address consisting of numbers such as 255.25.1.200.0. Each number is a component of that IP address. When IPv4 was introduced, only the first octet was used for the network number and the remaining three octets were used for the host number. This limited the...
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...4.4. DHCP Configuration:: 6 4.4.1. The Dynamic Host Configuration Protocol (DHCP): 6 4.4.2. The DHCP Server service provides many benefits: 6 4.4.3. Why use DHCP: 7 4.4.4. DHCP Server configuration: 7 4.4.5. Testing DHCP: 9 4.5. Domain Name System (DNS) 10 4.5.1. How DNS Works: 10 4.5.2. Fully qualified domain name: 10 4.5.2.1 Primary DNS server hassan-srv: 10 4.5.2.2 Testing DNS in the primary server hassan-srv: 14 4.6. Email Service: 14 4.6.1. Introduction...
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...Lab 2 worksheet CONFIGURING DNS AND DHCP THIS LAB CONTAINS THE FOLLOWING EXERCISES: Exercise 2.1 Designing a DNS Namespace Exercise 2.2 Creating a Zone Exercise 2.3 Creating Domains Exercise 2.4 Creating Resource Records Exercise 2.5 Creating a Scope Exercise 2.6 Confirming DHCP Server Functionality Exercise 2.7 Configuring DHCP Reservations Workstation Reset: Returning to Baseline Estimated lab time: 100 minutes |Exercise 2.1 |Designing a DNS Namespace | |Overview |You have been tasked with creating a test DNS namespace structure for your organization. Your first | | |task is to design that namespace by specifying appropriate domain and host names for the computers in| | |the division. | |Completion time |15 minutes | 2. In the diagram provided in Figure 2-1, write both the domain names and the fully qualified domain names that you have selected for the computers in the appropriate spaces. Figure 2-1 |Exercise 2.2 |Creating a Zone | |Overview...
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...Instructions: 1. Complete this assignment and submit it prior to the beginning of the next class meeting. 2. Completely fill in the bubble for the correct answer(s), any other mark such as an X or just a line through it will be marked as incorrect. 1. DHCP frees system administrators from manually configuring each host on the network. A True B False 2. The smaller the network, the greater the benefit of using a dynamic address assignment. A True B False 3. DHCP provides three key benefits to those managing and maintaining a TCP/IP network. A True B False 4. The key aspect of the DHCP process is that it is dynamic. A True B False 5. Once a DHCP scope is defined and exclusion ranges are applied, the remaining addresses form what is called an available address pool within the scope. A B True False 6. To conserve disk space, DNS servers store only the most recent updates. A True B False 7. The primary DNS server for a zone is not required to perform an incremental zone transfer. A True B False Steve Todd Page 1 of 8 8. For replication of Active Directory–integrated zones, DNS notification is needed. A True B False 9. Scavenging is enabled by default. A True B False 10. As long as the TTL for a cached resource record does not expire, a DNS server can continue to cache and use the resource record again when answering queries by its clients that match these resource records. A B True False 11. The Reverse Address Resolution Protocol (RARP) was designed for what reason? A B C D to...
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...network and high-speed links that are fairly reliable, you might be able to use one DNS server for a larger, multiple sub-netted network area. If you have a high number of client nodes on a single subnet design, you might want to add more than one DNS server to the subnet to provide backup and failover if the preferred DNS server stops responding. When determining the number of DNS servers you need to use, assess the effect of zone transfers and DNS query traffic on slower links in your network. Although DNS is designed to help reduce broadcast traffic between local subnets, it does create some traffic between servers and clients that should be reviewed, particularly when used in complexly routed LAN or WAN environments. Consider the effects of zone transfer over slower speed links, like those typically used for a wide area network (WAN) connection. Although the DNS Server service supports incremental zone transfers and DNS clients and servers can cache recently used names, traffic considerations are sometimes still an issue, particularly when DHCP leases are shortened and, as a result, dynamic updates in DNS are performed more frequently. One option for dealing with remote locations on WAN links is to set up a DNS server at these locations to provide caching-only DNS service. With most installations, you should have at least two server computers hosting each of your DNS zones for fault tolerance. DNS was designed to have two servers for each zone, one as a primary server and the...
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...like you to fix: a. The DHCP server has been assigning IP addresses that conflict with other addresses. How could this be happening? How can you fix it? A dynamic IP address conflict happens when the DHCP server assigns the same IP address to two computers. This happens because when a computer requests an IP address and the DHCP server doesn't check the network, but only checks the available IP addresses that it can lease. When another computer goes offline, the DHCP server makes that computer's IP address available for lease. However, if that computer goes online again it may think it still owns the IP address, resulting to a possible conflict. To resolve the dynamic conflict and get a different IP address, open the command prompt. Type the command "ipconfig /release" (without the quotes) and press "Enter." This releases its old IP address. After that, type the command "ipconfig /renew" (without the quotes) and press "Enter." This requests a new IP address from the DHCP server. b. A novice administrator has just completed a restoration of the DHCP database. However, this person has realized that the scope information displayed in the DHCP snap-in is inconsistent. They do not know how to fix this problem. Explain what most likely is required in this situation. In order to fix this problem, administrators need to reconcile the information between Windows registry and DHCP server database c. They would like an explanation of DNS zones because they are considering...
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...Name System consists of a hierarchical set of DNS servers. Each domain or subdomain has one or more authoritative DNS servers that publish information about that domain and the nameservers of any domains "beneath" it. The hierarchy of authoritative DNS servers matches the hierarchy of domains. At the top of the hierarchy stand the root nameservers: the servers to query when looking up (resolving) a top-level domain name (TLD) Features • Scalability—Because DNS is capable of distributing workload across several databases or computers, it can scale to handle any level of name resolution required. • Constancy—Host names remain constant even when associated IP addresses change, which makes locating network resources much easier. • Ease of Use—Users access computers using easy-to-remember names such as www. microsoft.com rather than a numerical IP address, such as 192.168.1.100. • Simplicity—Users need to learn only one naming convention to find resources on either the Internet or an intranet. 2.) DHCP stands for Dynamic Host Configuration Protocol. As the name suggests, DHCP is used to control the network configuration of a host through a remote server. DHCP functionality comes installed as a default feature in most of the contemporary operating systems. DHCP is an excellent alternative to the time-consuming manual configuration of network settings on a host or a network device. Features · DHCP client alternate configuration With DHCP client alternate configuration, you can easily...
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...Table of Contents INTRODUCTION 2 DESIGNING AND IMPLEMENTING AN AUTOMATIC IP-ADDRESSING MECHANISM 3 AUTOMATIC IP-ADDRESSING SCHEME FOR THE UWS NETWORK 3 INSTALLING AND AUTHORIZING A DHCP SERVER 4 CREATING AND CONFIGURATION OF DHCP SCOPES 8 CREATING AND TESTING DHCP CLIENT RESERVATIONS 10 IMPLEMENTING DHCP RELAY AGENTS 12 DOMAIN NAMING STRATEGY 16 DOMAIN NAME SERVICE INSTALLATION 17 DOMAIN NAME SERVICE LOOK UP ZONES 18 ZONE AUTHORITY DELEGATION 23 DNS DYNAMIC UPDATES 25 DNS RESOURCE RECORDS 25 NETBIOS NAME RESOLUTION 27 INSTALLATION OF WINS 27 STATIC WINS RECORD 28 CONFIGURING REPLICATION PARTNERS 30 ALTERNATIVE IP ADDRESSING STRATEGY 31 ALTERNATE NAME RESOLUTION TECHNIQUES 32 NETWORK PLAN FOR THE UWS GLASGOW SITE 32 NETWORK PLAN FOR THE UWS CLYDE SITE 33 NETWORK PLAN FOR THE UWS HEAD OFFICE SITE 33 OVERVIEW OF THE UWS NETWORK INFRASTRUCTURE AS A WHOLE 34 TROUBLESHOOTING STRATEGY FOR UWS NETWORK 34 BACK UP AND FAULT TOLERANCE STRATEGY FOR NETWORK SERVICES 38 NETWORK HEALTH MONITORING AND ANALYSES 38 CONNECTIVITY SOLUTIONS FOR MULTI-VENDOR -ENVIRONMENT 40 REMOTE CONNECTIVITY TO UWS NETWORK USING VPN 41 CONFIGURING INBOUND VPN CONNECTION 41 CONFIGURING REMOTE ACCESS POLICIES 45 CONFIGURING OUTBOUND VPN CONNECTION 48 NETWORK COUNTERACTIVE APPROACHES WITH REGARDS TO SECURITY THREATS 50 IMPLEMENTATION OF CERTIFICATE SERVICES 51 IPSEC IMPLEMENTATION 56 References 62 INTRODUCTION This is a case study about a company...
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...DNS and DHCP DNS is short for Domain Name System servers, and they provide name resolution for network clients. Among other things, DNS manages information that connects a computer's fully qualified domain name or FQDN to its assigned IP address. Sometimes, DNS links them to multiple addresses.On the other hand, DHCP provides a powerful mechanism for automatically configuring client IP addresses. At first, DHCP did not notify the DNS service to update the DNS records on the client. They just updated the client name to an IP address, and IP address to name mappings maintained by a DNS server. Without a way for DHCP to interact with DNS, the information maintained by DNS for a DHCP client may be incorrect. For example, a client may acquire its IP address from a DHCP server, but the DNS records would not reflect the IP address acquired nor provide a mapping from the new IP address to the computer name (FQDN). So in my opinion the number of computers you are setting up is irrelevant. The DHCP servers are kinda like the planning and zoning dept. When you build a house they give it an address. The DHCP server is in charge of giving out addresses to your computer. Unlike the zoning dept., your IP is leased from the DHCP server. That is because if your computer decides it wants to move to a different section of town, say for example, the landfill your DHCP server will give some other more worthy computer that address...
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