Exam 200-301 topic 1 question 916 discussion

Given MAC = 50 00 00 04 00 00 To make it EUI-64 IPv6, insert FFEE in the middle of the MAC, so it will become: 50 00 00 FF FE 04 00 00 After this, "5" in binary will be written as "0101" and "0" in binary as "0000" OR we can say "50" in binary can be written as 01010"0"0. Now, flip the 7th bit, so it will become "010100"1"0" and now this "010100"1"0" can again be written in decimal as "52" after flipping the 7th bit. So, finally it will become: 52 00 00 FF FE 04 00 00 And our EUI-64 IPv6 will be: 2001:db8::5200:00FF:FE04:0000 /64

A is also incorrect because the 7th bit of the MAC address was not flipped/set to 1. D is the correct answer.

Insert FF:FE in to the centre of the mac address. flip the 7th bit from far left.

5 in binary is 0101 0 in binary is 0000 So, 50 in binary is 0101 0000 Flipping the 7th bit: Original: 0101 0000 We change the second digit from left (0 to 1): Result: 0101 0010 Converting the result back to hexadecimal: 0101 in binary is 5 in hex 0010 in binary is 2 in hex So, 0101 0010 in binary is 52 in hexadecimal

Someones math is wrong in the binary look at it again

it´s D 5000.0004.0000 add in the middle FF FE it will be 5000.00ff.fe04.0000 then invert the 7th bit it will be 5200.00ff.fe04.0000

MAC to EUI-64 conversion SCENARIO: Router R1 has a MAC address of 5000.0004.0000 on its interface. The objective is to calculate the corresponding EUI-64 address based on this MAC address. Step #1: Split the MAC address in the middle: 5000.00 04.0000 Step #2: Insert FF:FE in the middle: 5000.00FF.FE04.0000 Step #3: Change the format to use a colon delimiter: 5000:00FF:FE04:0000 Step #4: Convert the first eight bits to binary: 5 0 -> 0101 0000 Step #5: Flip the 7th bit: 00000000 -> 0011 0010 Step #6: Convert these first eight bits back into hex: 0011 0010 -> 52, which yields an EUI-64 address of 5200:00FF:FE04:0000

D. is the correct answer.

A is incorrect. It doesn't invert the 7th bit.

Why you give us this incorrect answer? The answer is D 'cause the 7th bit after the eui-64 was flipped from 0 to 1, making the address look like 5200! Please, stop putting this wrong answer. Let the comunity choose. Apparently we know things better than your imaginary experts.

Why A is not correct ? the first address block 5000 its same in the question and answer can somebody explain why D is the answer ?

This answer was GUESSED I guess. :-/

The correct answers it's D

Anybody can mention which address you used from the table to implement the eui 64 calculations?

D is the only one that makes sense

..FF FE