35 votes 35 votes Which of the following fields of an IP header is NOT modified by a typical IP router? Check sum Source address Time to Live (TTL) Length Computer Networks gatecse-2015-set1 computer-networks ip-packet easy + – 🚩 Edit necessary | 👮 Arjun | 💬 “better answer needed” makhdoom ghaya asked Feb 13, 2015 makhdoom ghaya 10.3k views answer comment Share Follow See all 4 Comments See all 4 4 Comments reply Shivam Chauhan commented Oct 7, 2016 reply Follow Share @Kapilp how is length modified 2 votes 2 votes Vicky rix commented Oct 27, 2017 reply Follow Share If you fragment a datagram into smaller fragments then offcourse size of IP datagram becomes smaller and so Total_Length field of IP datagram will be modified... 28 votes 28 votes vikas commented Jan 23, 2018 reply Follow Share doubt here....Because TTL value modified by Hop Only, not by router so i think both B and C should be right.... 0 votes 0 votes Shubhanshu commented Jan 28, 2018 reply Follow Share @vikas Hops are links they are not the electronic devices which can change the value. 2 votes 2 votes Please log in or register to add a comment.
Best answer 42 votes 42 votes Source Address. Arjun answered Feb 14, 2015 • edited Oct 23, 2018 by Krithiga2101 Arjun comment Share Follow See all 14 Comments See all 14 14 Comments reply Show 11 previous comments Thadymademe commented Feb 17, 2023 reply Follow Share @mahendrapatel bro , Typical IP router most probably meant that we didn’t consider NAT IP router because in NAT IP routers source address can change. . 1 votes 1 votes mahendrapatel commented Feb 18, 2023 reply Follow Share @abir_banerjee so if typical not there,then answer could be different? 0 votes 0 votes Thadymademe commented Feb 18, 2023 reply Follow Share Most probably yes because we would have considered NAT routers . 0 votes 0 votes Please log in or register to add a comment.
5 votes 5 votes B. Source Address rpdhakad answered Jul 12, 2015 rpdhakad comment Share Follow See all 0 reply Please log in or register to add a comment.
4 votes 4 votes Since it has been asked for IP Header so Source adress will not change but if it was about the frame than source address (i.e MAC Address) is changed. arun.kmr.singh answered Jan 24, 2019 arun.kmr.singh comment Share Follow See all 0 reply Please log in or register to add a comment.
3 votes 3 votes Ans B Length and checksum can be modified when IP fragmentation happens. Time to live is reduced by every router on the route to destination. Shailendra_ answered Nov 22, 2019 Shailendra_ comment Share Follow See all 0 reply Please log in or register to add a comment.