One reason for the utilization of subinterfaces is to circumvent the principle of split horizon.  You call to mind from your CCNA studies that break up horizon dictates that a way cannot be advertised out the identical interface upon which it was figured out in the first place.  In the following example, R1 would be the hub and R2 and R3 will be the spokes.  All three routers are using their own physical interfaces for framework relay connectivity, and they are also running RIPv2 172.12.123.0 /24.  Each switch is also advertising a loopback user interface, using the router number for every single octet.

R1(config)#int s0

R1(config-if)#ip address 172.12.123.1 255.255.255.3

R1(config-if)#no frame inverse

R1(config-if)#frame map ip 172.12.123.2 122 broadcast

R1(config-if)#frame map ip address 172.12.123.3 123 broadcast

R1(config-if)#no shut

R2(config)#int s0

R2(config-if)#encap frame

R2(config-if)#no frame inver

R2(config-if)#frame map internet protocol 172.12.123.1 221 broadcast

R2(config-if)#frame map ip 172.12.123.3 221 broadcast

R2(config-if)#ip address 172.12.123.2 255.255.255.0

R3(config)#int s0

R3(config-if)#encap frame

R3(config-if)#no frame inver

R3(config-if)#frame map internet protocol 172.12.123.1 321 broadcast

R3(config-if)#frame road ip 172.12.123.2 321 transmitted

R3(config-if)#ip address 172.12.123.3 255.255.255.0

R1#show ip route rip

2.0.0.0/32 is subnetted, 1 subnets

R       2.2.2.2 [120/1] via 172.12.123.2, 00:00:20, Serial0

3.0.0.0/32 is subnetted, 1 subnets

R       3.3.3.3 [120/1] via 172.12.123.3, 00:00:22, Serial0

R2#show internet protocol route rip

1.0.0.0/32 is subnetted, 1 subnets

3rd r       1.1.1.1 [120/1] via 172.12.123.1, 00:00:06, Serial0

R3#show ip option rip

1.0.0.0/32 is subnetted, 1 subnets

R       1.1.1.1 [120/1] by using 172.12.123.1, 00:00:04, Serial0

The hub hub R1 has a route to both loopbacks, although neither spoke has a route to the other spoke’s loopback.  That’s because split skyline prevents R1 from advertising any network via Serial0 if the path was learned on Serial0 in the first place. 

We’ve got two options in this article, one of which is to disable spilt horizon on the interface.  While the process will have the desired effect in your little network, disabling split horizon is not a good idea and should be avoided whenever possible.  We’re not likely to do it in this lab, yet here is the syntax to do so:

R1(config)#interface serial0

R1(config-if)#no internet protocol split-horizon

A better solution is to alter subinterfaces on R1.  The IP addressing must be revisited, but that’s no problem here.  R1 and also R2 will use 172.12.123.0 /24 to speak, while R1 and R3 will use 172.12.13.0 /24.   R3′s serial0 interface will have to be renumbered, so let’s look at all three modem configurations:

R1(config)#interface serial0

R1(config-if)#encap frame

R1(config-if)#no frame inverse-arp

R1(config-if)#no ip

R1(config-if)#interface serial0.12 multipoint

R1(config-subif)#ip address 172.12.123.1 255.255.255.0

R1(config-subif)#frame map ip 172.12.123.2 122 broadcast

R1(config-subif)#interface serial0.31 point-to-point

R1(config-subif)#ip tackle 172.12.13.1 255.255.255.0

R1(config-subif)#frame interface-dlci 123

R2(config)#int s0

R2(config-if)#ip address 172.12.123.2 255.255.255.0

R2(config-if)#encap frame

R2(config-if)#frame map ip 172.12.13.3 221 broadcast

R2(config-if)#frame map ip 172.12.123.1 221 broadcast

R3(config)#int s0

R3(config-if)#ip address 172.12.13.3 255.255.255.0

R3(config-if)#encap frame

R3(config-if)#frame map ip 172.12.13.1 321 send out

R3(config-if)#frame map ip 172.12.123.2 321 broadcast

A frame chart statement always names your REMOTE IP address and the LOCAL DLCI.  Don’t forget the broadcast option!

Show frame map shows people that all the static mappings with R1 are up and running.  Note the “static” output, which indicates these mappings are a result of utilizing the frame map command.  Pings will not be shown, but all three wireless routers can ping each other at this stage.

R1#show frame map

Serial0 (up): ip address 172.12.123.2 dlci 122(0x7A,0x1CA0), static,

transmitted,   CISCO, status defined, energetic

Serial0 (up): ip 172.12.13.3 dlci 123(0x7B,0x1CB0), static,

broadcast,  CISCO, status defined, active

Following 172.12.13.0 /24 community is added to R1 and R3’s Split configuration, R2 and R3 now have one another’s loopback network in their RIP course-plotting tables.

R2#show ip route tear

1.0.0.0/32 will be subnetted, 1 subnets

R       1.1.1.1 [120/1] via 172.12.123.1, 00:00:20, Serial0

3.0.0.0/32 can be subnetted, 1 subnets

R       3.3.3.3 [120/1] via 172.12.123.1, 00:00:22, Serial0

R3#show ip route rip

1.0.0.0/32 is subnetted, 1 subnets

R       1.1.1.1 [120/1] via 172.12.13.1, 00:00:20, Serial0

2.0.0.0/32 will be subnetted, 1 subnets

R       2.2.2.2 [120/1] via 172.12.13.1, 00:00:22, Serial0

While turning divided horizon off is one way to attain total IP connectivity, the process can have other unintended outcomes.  The use of subinterfaces is a more effective method of allowing the spokes to see the hub’s loopback network.

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Mobile websites having faced remarkable challenges to overcome, has led to the advances in mobile handsets, and can now out perform the very system that saw the first landing on the moon. The scope of the various handsets available today being a challenge in itself since the start of mobile networks, no longer proving to be a difficult task, has enable developments like the iPhone and the Smart Phone or the latest generation, the Super Phone.

With the users favorite social and media websites now in their pocket, the applications for the mobile website and related industry, has exploded as a formidable recipe for success. Secure online financial services and trade now possible no matter where you are, setting a fast track for business and commerce.

The connectivity of mobile technology reaching with increasing realism for a personalized and completely mobile internet experience, whether IM networks, social media sites or competitive online cyber gaming, and the local citizen now able to choose to be a global citizen. As the mobile population has grown, exceeding traditional desktop PC access to the internet, the mobile networks and the mobile websites leading a path into the digital future.

The Mobile, now considered as the seventh mass media, grossed over two point two billion US Dollars in 2007. Today this figure is approaching ten billion US Dollars for music alone being purchased via mobile websites, and five billion US Dollars for various things ranging from horoscopes, ringtones, gaming and virtual gifts, to mention a few. Consequently, many marketers now focus upon mobile web design for their marketing outreach.

With the first commercial mobile web access offered in 1996, Finland kicked off what is today a vibrant and exploding multi-billion dollar industry worldwide, which saw itself reaching, and exceeding desktop computer bases access for the first time in 2008.

This immense milestone subtly coming and going, to now expand exponentially with advertising leading as the number one growing market on the mobile network. Mobile websites is essentially the networks for a coming generation of mobile devices far more efficient with information than most desktops and likely most current networks included. No more that fifteen years as yet, and this adolescent industry has proven its likely future as the greatest power in information management for both business and the individual that the world has ever seen.

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Although many people take home computer networking as a critical matter, it is quite a straightforward process. Almost all the advanced operating systems such as Windows, Mac OSX, and Linux support home computer networking and they provide easy wizard type dialog boxes for novice to configure a home network. Let’s see the essentials for setting up a home network.

First of all, you need to have two or more PCs or laptops for establishing home computer networking. The PCs that need to be interconnected expected to have network interface cards installed. Since the most of the modern PC come with a default network interface, you may not have to worry about this. Next, you will require a network hub or a router. Although both these devices do the same thing when it comes to home computer networking, they are employed in two different scenarios. The hub is just for joining the computers locally, but the router does the same thing while linking you to the high speed Internet. Based on your requirement, you can choose either of these two devices for home computer networking.

When you choose the router or the hub, make sure it has network ports equal to or more than of the number of computers you have at home.  In case if you can afford a wireless router or a wireless access point, then you can accomplish home computer networking in a more favourable manner. In this manner, you don’t have to wire the house. Rather, just keeping the computers at a range where the signals are strong is enough. When compared to the wired method, wireless can be quite pricy, since wireless network interfaces and wireless routers are costly than the traditional networking devices.

Once all the devices are unified the right way and powered, configuring the networking in the computers is a straightforward task. If you are a Windows or Mac OS X user, you can go to network connections and establish a home network through the wizard. If you are a Linux user, then I’m sure you know how to setup home computer networking!

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