XI. Look at the graphic below and complete the text with the following words:

host, data, encapsulation, retransmission, protocol, layer, link

As the user ___1___ is processed down through the ___2___ stack, each layer adds an encapsulation at the sending host. Data is transmitted "over the wire" at the ___3___ level, left to right. The ___4___ stack procedure is reversed by the receiving ___5___. Intermediate relays remove and add a new link encapsulation for ___6___, and inspect the IP ___7___ for routing purposes.

XII. What do you know about 3g Internet? Have you ever used it? Share your experience with your partner.

Read the short article about 3G Internet and fill in the gaps with the words in box.

Wi-Fi, device, wireless network, mobile phone, hardware, access, routers

3G Internet refers to third generation _____1____ technology, provided by _____2____ companies, which subscribers can use to access data at faster speeds than previous versions. It is typically used with ___3____ such as mobile phones, though any 3G capable ____4___ can access such a network. While it is similar to ____5____ in some respects, users typically use it for network ____6____ at more diverse locations. Certain devices can be used to extend the networking possibilities of this standard, such as ____7____ and other wireless hardware.

XIII. Read the passages below and choose the heading to each text. In two teams ask and answer questions about 3g Internet.

Difference between Wi-Fi and 3G Internet; Advantages of 3G; Expanded Networking; Access to 3G

a) ____________________________________

To access 3G Internet, a user must have a 3G compatible device like a mobile phone or a tablet. Most service providers require a subscription to use their 3G network.

b) ________________________________

Both WiFi and 3G Internet are similar; they provide users with wireless access to the Internet. The key difference lies in the fact that 3G networks also allow users to make phone calls and access other features from mobile devices, which require some sort of Internet connection to complete. WiFi® is mainly for surfing the Internet and typically a user cannot make a phone call using such a connection.

c) __________________________

Since 3G networks are more readily available than WiFi®, travelers may opt for 3G plans. Internet speeds are often slower on a 3G network than a broadband Internet connection, but the user can access the 3G Internet almost anywhere with signal coverage. This gives it a much broader range than other networks, which may be based on hotspots or hubs in certain areas.

d) _______________________________

Those people traveling for business who want to share a 3G broadband connection among a group of peers can set up a 3G network. To do so, the user needs a 3G router and modem, or a device that acts as both. The modem connects a computer to the 3G network and the router sends out a signal so others in the same room can connect to the Internet. One drawback of 3G Internet connection, however, stems from the short range it covers, typically only the size of a small room.