Chapter 9. Securing Layer 2 Technologies
This chapter covers the following topics:
VLAN and trunking fundamentals
Spanning-tree fundamentals
Common Layer 2 threats and how to mitigate them
We often take for granted Layer 2 in the network because it just works. Address Resolution Protocol (ARP) and Layer 2 forwarding on Ethernet are all proven technologies that work very well. This certification, the CCNA Security, was built with the presumption that candidates would have a CCNA in routing/switching or equivalent knowledge. With this knowledge, your understanding of the details about VLANs, trunking, and inter-VLAN routing is presumed. However, so that you absolutely understand these fundamental concepts, this chapter begins with a review.
The ...
Get Santos:CCNA Sec 210-260 OCG now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
