ccna 200 301 bookshelf vitalsource desktop

ccna 200 301 bookshelf vitalsource desktop.2001:db8:3c4d:12:0:0:1234:56abThis approach does help somewhat-at least we don't have to write out those unnecessary zeros over and over again! What about for multiple blocks of all-0 characters? You can also just omit them all - or at least some of them. Using the previous address as an example, we can replace the two consecutive all-0 blocks with two colons, and it becomes2001:db8:3c4d:12::1234:56abAwesome - we've replaced the block of all zeros with a double colon. When using this abbreviation, you need to follow the rule that you can only use a double colon to replace a set of contiguous blocks of all-0 characters in an IPv6 address. So if there are four all-0 blocks in an IPv6 address and they are not contiguous, you cannot replace all of them with double colons. Remember, you can only replace a set of all-0 character blocks with a double colon; look at the following address.2001:0000:0000:0012:0000:0000:1234:56abNote that woe is abbreviated thus.2001::12::1234:56abYou can abbreviate it like this.2001::12:0:0:1234:56abIf we omitted both sets of all-0 character blocks in this example, the device would not know how to recover these omitted zeros after seeing this address. the router would say after seeing this incorrectly written address, "Should I put two all-0 character blocks between the first pair of colons and the other two between the second pair of colons; or should I put the three all 0 character blocks in front and put the other one after? "This question will go on and on and the correct answer cannot be found because the information that can determine the correct address is not complete.