By Eric Vyncke
Divided into 4 components, LAN change safety provide you with steps you could take to make sure the integrity of either voice and information site visitors touring over Layer 2 units. half I covers vulnerabilities in Layer 2 protocols and the way to configure switches to avoid assaults opposed to these vulnerabilities. half II addresses denial-of-service (DoS) assaults on an Ethernet swap and exhibits how these assaults could be mitigated. half III exhibits how a swap can truly increase the safety of a community throughout the usage of wirespeed entry keep watch over checklist (ACL) processing and IEEE 802.1x for consumer authentication and authorization. half IV examines destiny advancements from the LinkSec operating workforce on the IEEE. For all elements, lots of the content material is seller self sustaining and comes in handy for all community architects deploying Ethernet switches.After analyzing this ebook, you have got an in-depth realizing of LAN safety and be ready to plug the protection holes that exist in various campus networks.
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Divided into 4 elements, LAN swap safeguard will give you steps you could take to make sure the integrity of either voice and information site visitors touring over Layer 2 units. half I covers vulnerabilities in Layer 2 protocols and the way to configure switches to avoid assaults opposed to these vulnerabilities. half II addresses denial-of-service (DoS) assaults on an Ethernet change and indicates how these assaults might be mitigated.
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Extra info for LAN Switch Security: What Hackers Know About Your Switches
Figure 1-10 Authentication with Asymmetric Cryptosystems Alice’s Private Key Alice’s Public Key Alice Bob Plaintext: Hello Encryption Ciphertext: %z$*@ Decryption Plaintext: Hello Because Alice cannot repudiate the computation (only Alice has her private key), this is called a signature. This completely differs from the symmetric cryptosystems, where HMAC can be repudiated. 18 Chapter 1: Introduction to Security Using asymmetric cryptosystems for authentication is painfully slow. Hence, the full message is not signed, but the message’s cryptographic hash is signed.
By using multicast, a source can reach an arbitrary number of interested recipients who can subscribe to the group (a special Class D IP address) it is sending to. The beauty of multicast is that, from the source’s perspective, it sends only a single frame. Only the last networking device replicates that single frame into as many frames as necessary, depending on the number of recipients. On Ethernet, multicast frames are identiﬁed by a special group bit being set to 1. It is the low-order bit of the high-order byte.
In a ﬁctitious network setting, shown in Figure 1-9, Alice, the message originator, uses Bob’s public key to ensure that only Bob, the intended recipient, can read the message. Because every entity has Bob’s public key, they can use it to encrypt the message. Only Bob has its private key, however, so only he can decrypt the cipher text to receive the original message. Cryptography Figure 1-9 17 Conﬁdentiality with Asymmetric Cryptosystems Bob’s Public Key Bob’s Private Key Alice Bob Plaintext: Hello Encryption Ciphertext: %z$*@ Decryption Plaintext: Hello Although this application of asymmetric encryption is perfectly valid, it suffers from low performance compared to symmetric-encryption algorithms.