What Cisco IOS feature prevents an attacker from filling up the MTU cache for locally
generated traffic when using path MTU discovery?
A.
Use NetFlow information to export data to a workstation.
B.
Force all traffic to send 1280-byte Packets by hard coding the MSS.
C.
Enable flow-label marking to track packet destination.
D.
Enable flow-label switching to track IPv6 packets in the MPLS cloud.
E.
Always use packets of 1500-byte size or larger.
Explanation:
How to Configure IPv6 MTU Path Discovery
Enabling Flow-Label Marking in Packets that Originate from the Device
Enabling Flow-Label Marking in Packets that Originate from the Device
This feature allows the device to track destinations to which the device has sent packets
that are 1280 bytes or larger.
Seems we are talking here about Path MTU discovery: in IPv6 it allows a host to dynamically discover and adjust to differences in the MTU size of every link along a given data
path.
Enabling Flow-Label Marking in Packets that Originate from the Device
This feature allows the device to track destinations to which the device has sent packets
that are 1280 bytes or larger.
SUMMARY STEPS
1. enable2. configure terminal
3. ipv6 flowset
4. exit
5. clear ipv6 mtu