IP addressing and Subnetting workbook

Every networking student should have a solid understanding of TCP/IP subnetting (Loshin, 1997). Subnetting’s importance in modern networking is reflected by its many and varied uses. It can enhance network performance by splitting up collision and broadcast domains in a routed network (Odom, 2000). Large networks can be organized into separate subnets representing departmental, geographical, functional, or other divisions (Feit, 1997). Since hosts on different subnets can only access each other through routers, which can be configured to apply security restrictions, subnetting can also serve as a tool for implementing security policies (Bulette, 1998). Dividing a large network into subnets and delegating administrative responsibility for each subnet can make administration of a large network easier. Routers can require that a WAN link connecting two networks must itself form a separate subnet (Bulette, 1998). Troubleshooting, diagnosing, and fixing problems in a TCP/IP internetwork typically require thorough familiarity with subnetting. Network design requires both the ability to understand and carry out subnetting.

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ip subnetting workbook

IP subnetting workbook is one of the best ways to get expertise in the subject of subnetting, calculating IPs. It is all about how much you are practicing. As a networking professional, you will have to face real situations of planning network structures, decide and design subnets, calculate IP address's, almost everything. You will never have confidence to face such situations unless you haven't practiced. You can find lots of free IP subnetting workbooks on the internet. So.. start downloading and practicing. 

Ccna PrepCenter - IP Subnetting from Networkers

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IP Subnetting

Visual ip subnettingA subnet allows the flow of network traffic between hosts to be segregated based on a network configuration. By organizing hosts into logical groups, subnetting can improve network security and performance.Subnet MaskPerhaps the most recognizable aspect of subnetting is the subnet mask. Like IP addresses, a subnet mask contains four bytes (32 bits) and is often written using the same "dotted-decimal" notation. For example, a very common subnet mask in its binary representation. 

Lab commands - VLAN configurations

Lab commands - VLAN configurations

Switch#enable "enter to privilage mode"


Switch#configure terminal  "Enter to Global configuration mode"


Enter configuration commands, one per line.  End with CNTL/Z.


Switch(config)#interface vlan 1 "Go to interface mode of VLAN 1"


Switch(config-if)#ip address 10.1.1.1 255.255.255.0 "Assign IP address for interface VLAN 1 with the subnet mask"


Switch(config-if)#no shutdown "make the interface up"


%LINK-5-CHANGED: Interface Vlan1, changed state to up
Switch(config-if)#
%SYS-5-CONFIG_I: Configured from console by console
Switch#




VIEW CONFIGURATIONS

Switch#show interfaces VLAN 1 "Show details of  interface VLAN 1"
Vlan1 is up, line protocol is down "Both vlan1 and line protocol must be up for working condition"


Hardware is CPU Interface, address is 0010.1116.ce76 (bia 0010.1116.ce76)
  Internet address is 10.1.1.1/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 1000000 usec,
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 21:40:21, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     1682 packets input, 530955 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     563859 packets output, 0 bytes, 0 underruns
     0 output errors, 23 interface resets
     0 output buffer failures, 0 output buffers swapped out



Switch#SHOW running-config "view running configurations of interface VLAN 1"

!
interface Vlan1
 ip address 10.1.1.1 255.255.255.0
!