Which Description Is Correct About How MTU Mismatches Are Addressed

Multiple Choice

Which description is correct about how MTU mismatches are addressed in the IS-IS neighbor-formation process?

A) IS-IS does not check for MTU mismatches when forming a neighbor relationship.
B) IS-IS checks the locally configured MTU against the MTU advertised in neighbor hello packets.
C) IS-IS checks the locally configured MTU against the MTU advertised in neighbor LSPs.
D) IS-IS pads hellos, so neighbor relationships will not be formed on links with mismatched MTUs.