Which two statements about jumbo Ethernet frames are correct? (Choose two.) overlay network protocols. These situations reduce the end-to-end effective MTU size which reduces throughput and network efficiency and sometimes causes application problems. Many network devices now support larger sizes of Ethernet frames and use of Jumbo Frames is becoming more common. This article covers how to determine if your network is capable of using Jumbo Frames and if you should enable this feature.

A.
A jumbo frame is an Ethernet frame with a payload greater than 1500 bytes.

B.
Jumbo frames are always a fixed standard length of 9000 bytes.

C.
Jumbo frames can increase the latency on a network due to the transmission of larger frames.

D.
Jumbo frames enable the transmission of iSCSI packets on the IP network.

Explanation:
Many networks use 1500-byte MTU size, but the MTU size can be reduced by encapsulation, tunneling or other
Reference: http://www.networkworld.com/article/2224722/cisco-subnet/jumbo-frames.html