...DHCP Troubleshooting Each subnet can have only a single DHCP scope with a single continuous range of IP addresses. To use several address ranges within a single scope or subnet for the DHCP service, you must first define the scope and then set any required exclusion ranges. Use the entire range of consecutive IP addresses that make up the local IP subnet for which you are enabling the DHCP service. Set exclusion ranges for any IP addresses within the scope that you do not want the DHCP server to offer or use for DHCP assignment. By setting an exclusion range for these addresses, you specify that DHCP clients are never offered these addresses when they request an IP address from the server. Excluded IP addresses can be active on your network, but only by manually configuring these addresses at hosts that do not use DHCP to obtain an address. To create a new DHCP scope: 1. Open the DHCP Microsoft Management Console (MMC) snap-in. 2. In the console tree, double-click the DHCP server you want to configure. 3. Right-click IPv4 or IPv6 and then click New Scope. 4. Follow the instructions in the New Scope Wizard. Before you create the scope, determine starting and ending IP addresses to be used within it. Depending on the starting and ending IP addresses for your scope, the DHCP console suggests a default subnet mask useful for most networks. If you know a different subnet mask is required for your network, you can modify the value as needed. When you finish creating...
Words: 283 - Pages: 2
...DHCP Troubleshooting Dear IT Admin: I am working at a branch office and have been tasked with changing out the DHCP scope to match the overall corporate IP address scheme. The main office assigned me an IP address range of 192.168.0.200 through 192.168.0.225. I changed the scope on Friday afternoon and came in on Monday morning to discover that only some of the workstations had picked up new leases from the new DHCP scope. Any ideas as to what may be happening what I might check or adjust? Thank you, Junior Admin From IT Admin: To: Junior Admin: A scope must be defined and activated before DHCP clients can use the DHCP server for dynamic TCP/IP configuration. DHCP servers do not communicate scope information with each other, you must be careful to define scopes so that multiple DHCP servers are not assigning the same IP address to multiple clients or assigning addresses that are statically assigned to existing IP hosts. A DHCP server can only service requests for a scope that has a network ID that is the same as the network ID of its IP address. Use the display dhcp server tree all command to verify that an address pool containing or residing on the same subnet as the subnet of the receiving interface’s IP address is configured. The DHCP server assigns IP addresses with leases (support for lease duration depends on the device model). If an IP address has passed its lease duration, the DHCP server does not assign the IP address. Execute the display dhcp server ip-in-use...
Words: 315 - Pages: 2
...Dear IT Admin: I am working at a branch office and have been tasked with changing out the DHCP scope to match the overall corporate IP address scheme. The main office assigned me an IP address range of 192.168.0.200 through 192.168.0.225. I changed the scope on Friday afternoon and came in on Monday morning to discover that only some of the workstations had picked up new leases from the new DHCP scope. Any ideas as to what may be happening, what I might check or adjust? Thank you, Junior Admin --- Dear Junior Admin, A common problem that happens more often than not is assuming as soon as DHCP options are changed that all PCs will automatically implement them. It sounds like this may be an example of that exactly. With DHCP when the computer comes online it does a broadcast search for a DHCP server. The server responds with a message offering an IP address, subnet mask, and default gateway as well as some DNS options and WINS if that is configured. Once the pc accepts it the DHCP server will send an acknowledgement message. At that point the PC will send back a message that it will take it and the DHCP server will send a message indicating that an IP address has been reserved for the lease period. At this point the PC will not contact the DHCP server again until halfway through the lease time, which is usually a default period of 8 days. If you want to force all of the PCs to grab a new IP address then you will have to go to each computer, open a DOS prompt, and...
Words: 350 - Pages: 2
...Unit 2: DHCP Troubleshooting Dear Junior Admin, Based on the what you have told me regarding the DHCP scope the overall corporate IP address, it sounds like you have a lease time settings which is probably set to renew ip addresses at the default times. Here is your options on what you can do with DHCP: Table 4.5 Default DHCP Options Code Option name Meaning 1 Subnet mask Specifies the subnet mask of the client subnet. This option is defined in the DHCP Manager Create Scope or Scope Properties dialog box. It cannot be set directly in the DHCP Options dialog box. 3 Router Specifies a list of IP addresses for routers on the client's subnet. Multihomed computers can have only one list per computer, not one per network adapter. 6 DNS servers Specifies a list of IP addresses for DNS name servers available to the client. 15 Domain name Specifies the DNS domain name that the client should use for DNS computer name resolution. 44 WINS/NBNS servers Specifies a list of IP addresses for NetBIOS name servers (NBNS). 46 WINS/NBT node type Allows configurable NetBIOS over TCP/IP (NetBT) clients to be configured as described in RFC 1001/1002, where 1 = b-node, 2 = p-node, 4 = m-node, and 8 = h-node. On multihomed computers, the node type is assigned to the entire computer, not to individual network adapters. 47 NetBIOS scope ID 1 Specifies a text string that is the NetBIOS over TCP/IP scope ID for the client, as specified in RFC 1001/1002. 51 Lease time ...
Words: 1115 - Pages: 5
...Unit 2. Assignment 1. DHCP Troubleshooting Dear Junior Admin: My first question would be what have you done to this point about the issue? What OS are the computers running that have not picked up the new DHCP scope? Start by checking the DHCP setting and configurations are they all correctly configured? Try renewing the IP addresses on the workstations that have not picked up the scope it maybe do to the IP lease agreement. The Lease period defined for your DHCP, I think 8 days for wire and 24 for wireless. So machines will not request a new IP address until this lease expires. If a Machine reboots (or any similar events like disabling then enabling the NIC), it will ask for a new IP address from the DHCP, so I think the few machines that received new IP addresses from the new scope were rebooted. You should also check the system event log and DHCP server audit log files for details on any problems. Make sure the address scope has enough addresses if not widen the scope range. Check to see if it is a router/firewall problem and makes sure you have the service enable. If the OS is Windows XP, there is a known issue in which Winsock corruption has caused this exact issue. If it is a Winsock corruption on an XP machine you One thing that you can try is: 1. Start 2. Run 3. type in 'cmd' (without the quotes) 4. in the command prompt type: netsh winsock 5. reset library 6. With prompts, it should look like C:\Windows...
Words: 287 - Pages: 2
...Lab 6: Basics of Troubleshooting Task 1: Six-Step Troubleshooting Process • Step 1: Ascertain what the problem is.It could be a problem with the Hard Disk. • Step 2: Write down probable causes of the problem. Somehow the Hard Disk was damaged or bios was attacked by a virus. • Step 3: Determine whether theories are correct through testing. Can go to the bios and find out if the Hard Disk is responding. • Step 4: Create and implement a plan to resolve the problem. Do the “Last known good Configuration” and work from there to resolve the problem. • Step 5: Verify that the problem has been fixed; employ preventive measures. Start repair and check Bois battery. • Step 6: Document the entire process. Complete Task 2: Last known Good configuration Utility 1. Complete 2. Complete 3. Question 1: How do you access the advanced Boot Options menu? First restart your computer, then press F8 to access the advanced boot options menu. Question 2: What does the Last Known Good Configuration utility do? It restarts your computer to the last time that it was working correctly so that you can repair it. Question 3: When would you use the Last Known Good Configuration utility? Provide at least one example. I would use it if I had installed a video card that didn’t work or was installed incorrectly. Task 3: Event Viewer 1. 2. Complete 3. Complete 4. Complete 5. Description: Event 219, the source is Kernel-PnP, and the event ID is 219. 6. Complete 7...
Words: 366 - Pages: 2
...The purpose of this paper is to critique the user manual of the Samsung 460DX-3 LCD display. The manual is set up in PDF form to easily be viewed on a computer or hand held device. There are numerous tabs to select that will allow the user to quickly find the information they are looking for. The manual seems to be in good written order with images and warnings to help the user operate the display. The first section of the manual is about safety instructions. This section includes both headers and footers to let the user know what subject they are reading about and also what page they are on. The images that are shown are really helpful in determining what may be dangerous to the user while operating the display. The manual uses the color red to show warnings and other images about the display such as the electrical plug and safe lifting instructions. The safety instructions are not vague in any way that would confuse the user. Anyone with the ability to read would be able to understand these safety instructions. The next section of the Samsung’s manual is the introduction section. This section explains to the user everything they must expect when they first get the display home. It shows how to take it out of the box safely and what contents should be in the package when first opening it. This section also includes headers and footers for the user. This section is very useful as it explains the different buttons and inputs that are located on the display. Images are present...
Words: 799 - Pages: 4
...Darius Murdock ------------------------------------------------- 2322 Saint Clair Drive, Temple Hills, MD 20748 ------------------------------------------------- 240-392-2369(home) 240-308-9360(cell) dariusm_murdock@hotmail.com, dmurdock114@email.itt-tech.edu SKILLS & ABILITIES Networking * TCP/IP /LAN/WAN / Cisco Router / OSI * Network Technology * GUI ApplicationsOperating Systems * Windows 2000/7/XP/8 * Windows Server 2008/2010 / Active Directory * Linux * VMwareHardware * Assemble/disassemble PC’s * Install, configure, troubleshoot and repair * Installation, testing and troubleshooting of cabling (Patch, Fiber, Twisted & Crossover)Software * Microsoft Word, Excel, PowerPoint, Outlook, Publisher, Visio * Exchange and Sendmail for E-mail servers * Install, and troubleshoot | Development * Intro Programming * Client Server General * Strong written and oral communication skills * Team building * Customer Service * Problem Solving * Reliable * Flexibility | EDUCATION ITT Technical Institute – Springfield, Virginia- Present Associate of Applied Science Degree in Information Technology – Network Systems Administration Anticipated Graduation Date: Spring 2015 Suitland High School- Forestville, Maryland- 2009-2013 High School Diploma RELEVANT EXPERIENCE Save A Lot Grocery Store- Store Clerk July 2014-Present * Stock store product in the all the aisles. * Greet...
Words: 300 - Pages: 2
...Dear Junior Admin My first question would be what have you done to this point about the issue? What OS are the computers running that have not picked up the new DHCP scope? Start by checking the DHCP setting and configurations are they all correctly configured? Try renewing the IP addresses on the workstations that have not picked up the scope it maybe do to the IP lease agreement. The Lease period defined for your DHCP, I think 8 days for wire and 24 for wireless. So machines will not request a new IP address until this lease expires. If a Machine reboots (or any similar events like disabling then enabling the NIC), it will ask for a new IP address from the DHCP, so I think the few machines that received new IP addresses from the new scope were rebooted. You should also check the system event log and DHCP server audit log files for details on any problems. Make sure the address scope has enough addresses if not widen the scope range. Check to see if it is a router/firewall problem and makes sure you have the service enable. If the OS is Windows XP, there is a known issue in which Winsock corruption has caused this exact issue. If it is a Winsock corruption on an XP machine you One thing that you can try is Start Run type in 'cmd' (without the quotes) in the command prompt type: netsh winsock reset library With prompts, it should look like C:\Windows > netsh netsh> winsock netsh winsock> reset library I think you need to restart also. Thank you, IT...
Words: 273 - Pages: 2
...Section 1: Networking Concepts CompTIA Network+ N10-005: 1.1a – The OSI Model Through the years, the OSI model has been the fundamental model for networking. In this video, you’ll get an overview of the OSI model and a detailed breakdown of each of each OSI layer. CompTIA Network+ N10-005: 1.1b – The TCP/IP Model The OSI model isn’t the only model in town. In this video, you’ll learn about the TCP/IP model and how real-world applications are associated with each layer. CompTIA Network+ N10-005: 1.2 – The OSI Model in the Real World The OSI model is a useful reference, but how does it really work in the real world? In this video, we’ll investigate how the OSI model maps into an encrypted email conversation with Google Mail. CompTIA Network+ N10-005: 1.3a – Binary Math Calculating in binary is an important skill for any network professional. In this video, you’ll learn the fundamentals for converting between decimal and binary numbers. CompTIA Network+ N10-005: 1.3b – IP Classes The history of TCP/IP includes numerous changes in network technologies and subnetting. In this video, you’ll learn how the IP class-based numbering system was used in the past and how it’s used today. CompTIA Network+ N10-005: 1.3c – Classless Inter-Domain Routing CIDR-block addressing has added new flexibility to IP subnetting. In this video, you’ll learn about classless inter-domain routing and the notation used to designate a CIDR-block address. CompTIA Network+ N10-005: 1...
Words: 4714 - Pages: 19
...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...
Words: 5792 - Pages: 24
...IP Troubleshooting Small Group Exercise Activity Overview: This is a small group activity consisting of an IP troubleshooting exercise consisting of five scenario based questions. The exercise begins with a review of a recommend IP troubleshooting procedure and continues with five scenario based questions. Simplified IP Troubleshooting Procedures: Host: * Verify layer-1 and layer-2 * Physical connectivity to the host to connected. Ethernet connection should indicate electrical connectivity with some type of LED indicator light. * Verify OS detecting network interface correctly by verifying drivers installed correctly and OS display the interface as “connected” * If you have access to switching infrastructure ensure that host is assigned to the proper VLAN with the correct interface switching type (access or trunk) * Verify layer-3 * Verify IP address assignment configuration with “ipconfig /all” command on MS Windows OSs * IP address and mask correctly assigned? * Default gateway; is the host on the same IP subnet as the default gateway? * Attempt to ping default gateway, * If successful host has layer-3 connectivity to directly connection network * If unsuccessful attempt to ping other host on directly connected IP subnet * If host is having issues with pinging hosts on directly connected network, verify ARP resolution by using the command ”arp –a” command. This command...
Words: 1729 - Pages: 7
...DHCP Troubleshooting From: Admin To: Junior Admin One very common DHCP related issue is the assignment of an unexpected IP address. For example, suppose that your DHCP server was configured with an IP address scope of 192.168.0.1 to 192.1680.50. You would expect network hosts to be assigned IP addresses in this range. Now, suppose that a workstation on your network appeared to be having problems communicating with network servers. You issue an IPCONFIG /ALL command to view the workstation’s IP address configuration. Instead of the expected address range, the workstation has been assigned an address beginning with 169.254. If a host on your network is unexpectedly assigned an address beginning with 169.254, you can rest assured that the address was not assigned by your DHCP server. What actually has happened is that the workstation has failed to contact a DHCP server. When this occurs, the workstation will assign itself an IP address using a Windows feature known as Automatic Private IP Addressing (APIPA). Microsoft built Automatic Private IP Addressing into Windows as a way of helping those who have very small networks. For example, if you were to create a small Windows network, you would not have to manually configure IP addresses even if there were no DHCP server on the network. APIPA would automatically assign a unique class B IP address to each machine on the network. This is great for small home networks but completely inappropriate for larger networks. If a workstation...
Words: 474 - Pages: 2
...like a translator for the USB device so the computer understands what the USB device is doing. 3) Troubleshooting The most common issue is that either the driver is corrupted or the driver is the incorrect one. To fix this use the disk the printer came with and reinstall the driver or go to the products website and download the driver for that product and model. Topic 2: The OSI Model 1) Definition The OSI model is a conceptual model that characterizes and standardizes the internal functions of a communication system by partitioning it into abstraction layers. 2) Application 3) Troubleshooting Topic 3: SOHO Broadband 1) Definition The current available broadband solutions are cable, dialup(IDSN), satellite, ADSL(much like dialup) but higher rates 1500Kbps down and 256Kbps up,DSL(carries signal as digtal without have to convert it from analog and its faster) and wireless (Verizon ect) 2) Application I would use a wireless network that would allow everything to hook up to my network. 3) Troubleshooting I would start checking to see if it is network wide or certain sections of the network. If it is the entire network I would start looking towards my main switch and server but it was a certain section of the area of a network I would start at that switch and work my way back towards the server. Topic 4: TCP/IP 1) Definition 2) Application 3) Troubleshooting Check IP address, Subnet Mask, Default Gateway Topic 5: Client Server 1) Definition A domain is...
Words: 992 - Pages: 4
...T. J. Johnson NT 1330 Prof F. Pinkerton 12-19-2014 Unit 2 Assignment 1 DHCP troubleshooting Hello Mr. Junior Admin You have previously stated that you where tasking with changing the DHCP scope to match your IP addressing scheme. The IP address range you stated is of 192.168.0.200 through 192.68.0.225. You also said that you left Friday afternoon the day of the change and returned Monday morning to see that only some workstations had picked up the new leases from the new DHCP scope. I have come up with a couple solutions and approaches to just make sure everything you have done is right. First of all make sure you have implemented everything correctly in your DHCP scope range sometimes it’s a simple number mistake that can throw everything out the window also do the same for your subnet inputs any slight number will destroy everything that you are trying to achieve. Make sure the scope is under the established DHCP local role IP address range on your assigned server. My next approach would be to see if there’s connectivity between your user machines to the network. Make sure your NIC’s are all up to date and working. Most of these approaches I understand are very simple but it does not hurt to check up on. Another approach is rather long and very tedious but depending on how many users you have I would relay a memo to most of them with instructions to release their IP addresses and renew them through the console command input. I understand that most users may not...
Words: 341 - Pages: 2
