The only portal you can make right now is a Nether portal. Same with the PC version. (without mods)
There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
No, the Xbox edition of minecraft is not the same as the computer version, also the Computer and Xbox versions have different development teams. While the xbox version would be around Beta 1.7 in computer mc terms the computer version is in official release 1.4. The end portal for computer did not come out until the 1.9 beta times.
If you want to go to the end using this you can't the End isn't implemented.
120 is the Minecraft I.D. code for the end portal frame.
In pure survival, it is impossible to make an End Portal Frame. If you encounter a naturally generated portal, you must place eyes of ender in each of the frames. An eye of ender is crafted by an ender pearl and blaze powder.
As of the time of this answer, no. The current version is like the Beta 1.7.3 version on the PC, and strongholds were not introduced on the PC until Beta 1.8, one version later. The End portal was also not a part of strongholds until Minecraft 1.0.0.
The nether portal and the newest one, the end portal.
You can't you need to find it in a stronghold :) Not true you can get it using tooo many items :)
Place 3 End Portal Frame blocks on each side without corners, then place Eye of Ender in each frame to activate your portal. Note that, End Portal Frames cannot be obtained using Creative Mode and the give command. Mods will be required to obtain it.
4J Studios hasn't put in The End yet but there's still portal frames (creative mode only)
To enter an End Portal in Minecraft, you need to find a Stronghold where the portal frame is located. First, place Eyes of Ender into each of the portal frame blocks until all twelve slots are filled; the portal will activate and display a starry portal surface. Then, jump into the activated portal to be transported to the End dimension. Make sure you're prepared, as the End is home to the Ender Dragon and other challenges!