Refer to the exhibit. The IPv6 address for the LAN segment on router R1 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router?
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CCNA Exam - Question 1320
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Correct Answer: B
The correct IPv6 address must be derived from the MAC address of the router's interface, which includes the steps of splitting the MAC address, inserting FFFE in the middle, and flipping the 7th bit of the first octet. The MAC address provided for E0/1 on R1 is CA-01-BE-4A-00-01. First, split the MAC address into two parts and insert FFFE in the middle: CA01:BEFF:FE4A:0001. Next, convert the first octet CA from binary to hexadecimal and flip the 7th bit. The binary representation of CA is 11001010, which after flipping the 7th bit becomes 11001000, equivalent to C8 in hexadecimal. Therefore, the address becomes 2001:db8:1a44:41a4:C801:BEFF:FE4A:1. This matches option B.
Discussion
12 comments[Removed]
May 17, 2024Keba889 2 weeks, 3 days ago B is correct because C= 1100 a=1010 (after converting the 7th bit, this becomes 1000 = 8 Hence, C8 (not C2) so the final correct answer is: 2001:db8:1a44:41a4:C801:BEFF:FE4A:1
Hov13
Jan 26, 2025what are you guys talking about , the eUI 64 adds the FFFE in the middle of the MAC .. where it goes in between be-4a so be - FF FE 4a so B is the answer .. all these binary and conversation is unnecessary
ladarius01
Mar 1, 2024Given answer is correct. Split MAC and insert FFFE then invert 7th bit which makes A(1010) - > 8(1000)
Crawl_SC
Feb 25, 2024A is the correct answer
DaimonANCC
Mar 27, 2024if A if right, where going letter E??? BEFF?
lmmujsiOption: B
Mar 28, 2024Comparing this with the options provided: A. 2001:db8:1a44:41a4:C081:BFFF:FE4A:1 - This is incorrect because C081 should be C201. B. 2001:db8:1a44:41a4:C801:BEFF:FE4A:1 - This is incorrect because C801 should be C201. C. 2001:db8:1a44:41a4:4660:592F:FE65:1 - This is incorrect as it doesn't correlate with the EUI-64 modification of the provided MAC address. D. 2001:db8:1a44:41a4:C800:BAFE:FF00:1 - This is incorrect because C800:BAFE doesn't match the MAC address after applying EUI-64 modification. However, none of the given options exactly matches the expected result. The closest option is B, but it has an incorrect octet C801 instead of C201. There could be a typo in the options or in the understanding of the MAC address manipulation. Please double-check the available options and the process to ensure accuracy.
Mizuki_kun21
Jun 13, 2024Just fyi, it seems you don't quite have the bit flip down just yet. for your reference: 0 1 2 3 4 5 6 7 8 9 A B C D E F This reference table tells you what a bit will flip to. It is read in pairs from top to bottom and back
Mizuki_kun21
Jun 13, 2024Or to explain it further: 0<->2 1<->3 4<->6 5<->7 8<->A 9<->B C<->E D<->F
Mizuki_kun21
Jun 13, 2024Or to explain it further: 0<->2 1<->3 4<->6 5<->7 8<->A 9<->B C<->E D<->F
Keba889
Apr 30, 2024B is correct because C= 1100 a=1010 (after converting the 7th bit, this becomes 1000 = 8 Hence, C8 (not C2) so the final correct answer is: 2001:db8:1a44:41a4:C801:BEFF:FE4A:1 (If this is incorrect, please explain why.) Thanks
ModernSisyphus
Mar 2, 2024A is correct
KuyaErik101Option: A
Mar 24, 2024but is should be c801:bfff:fea4:1 another typo error
bezkin
Sep 28, 2024You were looking at router 2. i did the same at first, got to carefully read the questions.
[Removed]Option: B
Apr 11, 2024B is correct
xplinty666Option: A
Apr 13, 2024For me the correct is A
Hov13
Jan 26, 2025ok so the R1 E0/1 MAC is ca-01-be-4a-00-01 ==> ca-01-be- (center)-4a-00-01 so the eUI 64 adds the FFFE in the middle of the MAC .. where it goes in between "be" and "4a" so => be-FFFE-4a so B is the answer .. all these binary and conversation is unnecessary
OluwasheeunOption: B
May 16, 2024B is correct
bymrdasOption: B
May 21, 2024correct