Question

(5 marks) A 2900-byte datagram arrives at a router link that has a maximum transmission unit of 600 bytes. The original datagram has an identification number of 1337. How many fragments will be generated and what are the relevant fields in the IP datagram(s) that will be related to fragmentation. This question is probably best addressed with a diagram of the datagrams showing the relevant fields. 3. 4. (2 marks) Does a router inside an AS (non-edge router) need to know the routing table of an edge router for the AS? If so, why?

Answer 1

clataqram) 200 bytes MTO link = 600 bytes zimum size et clata field in each -ia q me t = 580 20 bytes+ IP header) teNumber 9eired +rag ments 29o0- 2 0 580 1O ments fraqment have Identificatton tach Number 1334

Offset is o aqment 2 600 bytes sie fta Fhaqment 3 -> Goo bytes i:e inq Fragment H → 600 bult 12e offset 218 Fragment 5 → 500 bytes Size offset-β 290 sto .* A Stouter inside ar As Is . ree to choose te n mechanism!s orouting -* -Auronomous Sjstems be connected to a core router and 1t' have the full information "* -These glouters uhch are raidefIs have no necessarj to Shos know -lhe ouinq table

edge outer Because f sourer inside as sendi a packet to edge siourer t can soute -to ge spective慨) Networks