CCNA 1. Networking Basics v3.1.1 Student Lab Manual (796248), страница 22
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What is the decimal and binary range of the first octet of all possible Class B IP addresses?Decimal:From: ________To: ________Binary:From: ________To: ________2. Which octet(s) represent the network portion of a Class C IP address? ___________________3. Which octet(s) represent the host portion of a Class A IP address? ______________________4. What is the maximum number of useable hosts with a Class C network address? ___________5.
How many Class B networks are there? ___________________6. How many hosts can each Class B network have? __________________________7. How many octets are there in an IP address? ________How many bits per octet? __________Step 3: Determine the host and network portions of the IP addressWith the following IP host addresses, indicate the following:•Class of each address•Network address or ID•Host portion•Broadcast address for this network•Default subnet maskThe host portion will be all zeros for the network ID. Enter just the octets that make up the host.
Thehost portion will be all ones for a broadcast. The network portion of the address will be all ones forthe subnet mask. Fill in the following table:Host IP AddressAddressClassNetworkAddressHostAddressNetwork BroadcastAddressDefault SubnetMask216.14.55.137123.1.1.15150.127.221.244194.125.35.199175.12.239.244Step 4: Given an IP address of 142.226.0.15 and a subnet mask of 255.255.255.0, answer thefollowing questions:What is the binary equivalent of the second octet? _____________________________________What is the class of the address? _________________________________________________What is the network address of this IP address? ______________________________________3-4CCNA 1: Networking Basics v 3.1 - Lab 9.2.7Copyright 2003, Cisco Systems, Inc.Is this a valid IP host address (Y/N)? ______________________________________________Why or why not?______________________________________________________________________________________________________________________________________________________________________________________________________________________________Step 5: Determine which IP host addresses are valid for commercial networksFor the following IP host addresses, determine which are valid for commercial networks and indicatewhy or why not.
Valid means it could be assigned to any of the following:•Workstation•Server•Printer•Router interface•Any other compatible deviceFill in the following table:IP Host AddressValid Address?(Yes/No)Why or Why Not150.100.255.255175.100.255.18195.234.253.0100.0.0.23188.258.221.176127.34.25.189224.156.217.734-4CCNA 1: Networking Basics v 3.1 - Lab 9.2.7Copyright 2003, Cisco Systems, Inc.Lab 9.3.5 DHCP Client SetupObjectiveThe purpose of this lab is to introduce Dynamic Host Configuration Protocol (DHCP) and the processfor setting up a network computer as a DHCP client to use DHCP services.Background / PreparationDHCP provides a mechanism for dynamically assigning IP addresses and other information. ADHCP server device located on the LAN or at the ISP can respond to a host request and furnish allof the following required information:•IP address•Subnet mask•Default gateway•Domain Name System (DNS) server•Other resource addressesWithout DHCP all of the above information would have to be manually configured on each hostindividually.The DHCP device is typically a network server.In small networks, DHCP services can be provided by a small router.
This includes many homenetworks with DSL, cable, or wireless connections. Cisco and many other manufacturers offer smallrouters that include the following features:•An Internet or WAN connection•A small built-in hub or switch•A DHCP server serviceThis lab will focus on setting up a computer to use the DHCP services provided.This lab assumes the PC is running any version of Windows. Ideally, this lab will be done in aclassroom or other LAN connected to the Internet. It can also be done from a single remoteconnection via a modem or DSL-type connection.Note: If the network that the computer is connected to is using static addressing, follow thelab and view the various screens.
Do not try to change settings on these machines. Thestatic settings will be lost and would require reconfiguration.Step 1 Establish a network connectionIf the connection to the Internet is dialup, connect to the ISP to ensure that the computer has an IPaddress. In a TCP/IP LAN with a DHCP server it should not be necessary to do this step.Step 2 Access a command promptWindows NT, 2000, and XP users will use the Start menu to open the Command Prompt window.The Command Prompt window is like the MS-DOS Prompt window for other Windows versions:1-7CCNA 1: Networking Basics v 3.1 - Lab 9.3.5Copyright 2003, Cisco Systems, Inc.Start > Programs > Accessories > Command Prompt or Start > Programs > Command PromptTo open the MS-DOS Prompt window, Windows 95, 98, and ME users will use the Start menu:Start > Programs > Accessories > MS-DOS Prompt or Start > Programs > MS-DOS PromptStep 3 Display IP settings to determine if the network is using DHCPWindows 95/98/ME users:Type winipcfg and press Enter, then click the More Info button.The example below indicates that DHCP is in fact being used by the entries in the following boxes:•DHCP Server IP address•Lease Obtained•Lease ExpiresThese entries would be blank in a statically configured device.
DHCP also supplied the DHCP andWINS server addresses. The missing default gateway indicates a proxy server.Windows NT / 2000 / XP users:Type ipconfig/all and press Enter.The following Windows NT, 2000, and XP example indicates that DHCP is in fact being used by theDHCP enabled entry. The entries for the DHCP Server, Lease Obtained, and Lease Expiresconfirm this fact. These last three entries would not exist in a statically configured device and DHCPenabled would say No.2-7CCNA 1: Networking Basics v 3.1 - Lab 9.3.5Copyright 2003, Cisco Systems, Inc.Is DHCP running on the network? _______Ask the instructor or lab assistant for help if it is hard to tell whether or not the DHCP is actuallyrunning.What is the length of the DHCP lease? _________DHCP servers provide IP addresses for a limited time, usually several days.
However, the actuallength of time can be configured by the network administrator. If a lease expires, the IP address isreturned to the pool to be used by others. This allows DHCP to recapture inactive IP addresseswithout humans having to update the records. An organization that lacks enough IP addresses forevery user may use very short lease durations, so that they are reused even during brief periods ofinactivity.When a computer stays connected to the network and remains powered on, it will automaticallyrequest that the lease be extended.
This helps a computer avoid an expired lease as long as it isused regularly.Sometimes a computer is moved from one network to another where the network portion of the IPaddress is different. When this happens, the computer may still retain its settings from the oldnetwork and be unable to connect to the new network. One solution is to release and renew thelease. Statically configured computers can do this, but there will be no change. Computersconnected directly to an ISP may lose connection and have to replace their call, but no permanentchanges will occur.
Follow these steps to release and renew the DHCP lease:Windows NT/2000/XP users:Type ipconfig/release and press Enter. Look over the results and then type ipconfig/renew.Since the machine did not actually change locations as described above, the same settings asbefore will probably appear. If the machine had been moved as described above, a new settingswould appear.Windows 95/98/ME users:Click on the Release All button. Look over the results and then click on the Renew All button.Since the machine did not actually change locations as described above, the same settings asbefore will probably appear. If the machine had been moved as described above, new settings wouldappear.3-7CCNA 1: Networking Basics v 3.1 - Lab 9.3.5Copyright 2003, Cisco Systems, Inc.Step 4 Accessing the network configuration windowOn the desktop, right click on the Network Neighborhood or My Network Places icon and chooseproperties.
If neither icon on the machine, try using the Start button:Start > Settings > Control PanelThen double click on the Network icon.Some users will see a screen like the Network properties box shown below:Different versions of Windows will have slightly different tabs and the current configuration of thecomputer will determine the items included in the Network Components box.
However, the boxshould still look similar to the one above.Most Windows 95, 98, and ME systems should see the Network Properties at this point. So, if aNetwork window similar to the one above is shown, skip to the next numbered step.Windows 2000 and XP users need to do two more things.In the window, double-click on Local Area Connection.When the Local Area Connection Status window appears, click on the Properties button. That willbring up a Local Area Connection Properties similar to the one shown in the next step.4-7CCNA 1: Networking Basics v 3.1 - Lab 9.3.5Copyright 2003, Cisco Systems, Inc.In the network properties window scroll through the listed components and find a listing for TCP/IP. Ifthere is more than one listing, find the one for the current network connection, such as NIC ormodem.
In Windows 2000 and XP it will look like the following:Select the appropriate TCP/IP entry and click on the Properties button or double-click directly on theTCP/IP entry. The screen that will appear next depends again on the version of Windows beingused, but the process and concepts are the same. The screen below should look very similar to whatWindows 2000 and XP users are seeing.
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