Good wireless security audit is not only practical testing, but also proper documentation, including recommendations of how to make wlan more secure. However, manual key management is not desirable for large networks. This can be considered a continuation of the work we presented at def con 23 evaluating layer 2 network security. Security features on switches securing layer 2 cisco press. Lisa bock, a security ambassador, explains the difference between the control, data, and management planes in networking, and provides to an overview of layer 3 attacks and techniques for securing cisco routers.
Packet tracer layer 2 security amazon web services. There is a bunch of possible audits, one can try to perform. Hence, there is need to employ security controls at each layer to ensure foolproof security. In this mode the firewall routes traffic between multiple interfaces, each of which is configured with an ip address and security zone. Layer 2 data link layer encryption is a highperformance security option that offers some advantages over layer 3networking layer encryption in some scenarios, particularly in unified. Exploring layer 2 network security in virtualized environments. The user is authorized to access the router administrative access or the network based on information found in the cisco secure acs database. One thing i dont cover in this video is setting a static mac address for security, so ill do it. Cisco is continuously raising the bar for security, and security feature availability at layer 2. On the switch i created my own vlan also called 183, trunked it and added a few local switch ports to this vlan. Describe the function and operation of layer 2 switching. I had a great time meeting with a variety of customers at cisco live in orlando back in june. When you go to a bar or nightclub, security checks your id to verify who you are. Cisco wireless security soluons layer 2 aacks the challenge of wireless security implementaon of wireless systems presents a unique security concern in that wireless is an uncontained medium.
Understanding layer 2 encryption the newberry group. The layer 3 switch functions at the network layer and performs the multiport, virtual lan, data pipelining functions of a standard layer 2 switch. The switch cisco ios software provides many security features that are specific to switch functions and protocols. Your drivers license validates your ability to drive. Switches are susceptible to many of the same layer 3 attacks as routers. Configuring asa basic settings and firewall using cli duration. Vlan is layer2 technology which works closely on ethernet. Backing up cisco ios router image basic configuration of adaptive security. Data communication and computer network tutorialspoint. Secure spanningtree parameters to prevent stp manipulation attacks. Wlan requires additional information in the layer 2 header of the frame. Lesson 17 cisco network foundation protection nfp framework management plane, control plane and data plane.
The cisco security portal provides actionable intelligence for security threats and vulnerabilities in cisco products and services and thirdparty products. The vulnerability is due to insufficient validation of l2tp packets. Network security deals with all aspects related to the protection of the sensitive information. An attacker could exploit this vulnerability by sending a crafted l2tp packet to an affected device. It can also perform basic routing functions between virtual lans. Cisco switches offer a wide range of security features at layer 2 to protect the network traffic flow and the devices themselves. Check for physical interface problems like duplex mismatch. Layer 2 security features on cisco catalyst layer 3 fixed. Enable trunking and configure security on the new trunk link between sw1 and sw 2.
Layer 2 firewalls for the data center a breakdown of deploying layer 2 firewalls in the data center. Wireless security is nothing but protecting computers, smartphones, tablets, laptops and other portable devices along with the networks they are connected to, from threats and vulnerabilities associated with wireless computing. Understanding and preparing for network threats is important, and hardening layer 2 is becoming imperative. Wireless security tools, should be used to test audit wireless implementations regularly. Next, she addresses layer 2 attacks and techniques to secure cisco. Cn encryptors provide access control, authentication and confidentiality of transmitted information between secured sites. One thing i dont cover in this video is setting a static mac address for security, so ill do it here. Junit loadrunner manual testing mobile testing mantis postman. Clean up unwanted transport and network layer options. Security technical implementation guides stigs that provides a methodology for standardized secure installation and maintenance of dod ia and iaenabled devices and systems. For optimum performance and security, the administrator would like to ensure that the root bridge is the 3560 central switch. Ccna security 210260 section 8 securing layer 2 infrastructure. This document will explain you initial layer 2 troubleshooting steps with some helpful ios command.
Reduce security alerts by 2 10x by adding umbrella as the first layer of defense in your security stack, which will block gardenvariety threats that add noise as well advanced threats that no one else sees. Layer 3 deployment mode is a popular deployment setup. This can be mitigated by adding redundancy at the server layer. As a result, clientserver networks can scale far larger than peertopeer networks. Network security is the security provided to a network from unauthorized access. Layer 3 addressing i think there a lot of confusion with arp comes from is in regards to how the ip address and the mac address work together. Application presentation session transport network data link physical application transport internet network access layer 2. Zonebased policy firewall, cisco ios xe release 3s 2 layer 2 transparent firewalls information about layer 2 transparent firewalls. A vulnerability in the layer 2 tunneling protocol l2tp parsing function of cisco ios and cisco ios xe software could allow an unauthenticated, remote attacker to cause an affected device to reload. This exam tests a candidates knowledge of implementing and operating core security technologies including network security. This tutorial introduces you to several types of network. In this lab, you will configure ssh access and layer 2 security for s1 and s2. Ccna is a popular certification course among computer network engineers. Unfortunately this means if one layer is hacked, communications are compromised without the other layers being aware of the problem security is only as strong as the weakest link.
Create a new management vlan vlan 20 and attach a management pc to that vlan. The firewall interfaces can also be configured to obtain their ip address via a dhcp server and can be used to manage the security. Layer 2 switch security technical implementation guide cisco. Ccna security lab securing layer 2 switches topology. Network security deals with all aspects related to the protection of the sensitive information assets existing on the network. Configuring mplsaware netflow cisco ios netflow features roadmap netflow layer 2 and security. Background information similar to routers, both layer 2 and layer 3 switches have their own sets of network security requirements. It covers various mechanisms developed to provide fundamental security services for data communication. The advised me to connected a layer 2 switch directly to the port they had configured vlan 183 on. Objectives assign the central switch as the root bridge. Understanding, preventing, and defending against layer 2. The data link layer is often overlooked and trusted as it is limited by the organization physical boundaries is this true.
A free ccna tutorial site that closely follows the cisco ccna curriculum. Network security is not only concerned about the security of the computers at each end of the communication chain. Refer to cisco technical tips conventions for more information on document conventions. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Pdf exploring layer 2 network security in virtualized. These devices scan the networks and identify potential security problems. Sliding window protocol set 2 receiver side sliding window protocol set 3 selective. When to encrypt at layer 2 or layer 3 network computing.
The family includes ssl versions 2 and 3 and tls protocol. This document provides a sample configuration for some of the layer 2 security features, such as port security, dhcp snooping, dynamic address resolution protocol arp inspection and ip source guard, that can be implemented on cisco catalyst layer 3 fixed configuration switches. Video showing how to setup and view basic configurations and port security on cisco switches. Layer 2 firewalls for the data center network world. Understanding layer 2 encryption technical hitepaper 2 product architecture cn series encryptors are inline devices located on the edge of a network between a local private network, and a remote public network. Reduce security alerts by 2 10x by adding umbrella as the first layer of defense in your security stack, which will block gardenvariety threats that add noise as. Objectives connect a new redundant link between sw1 and sw 2. Here you can find articles that will help you to study for your ccna exam. This is an introductory tutorial that covers the basics of wireless security. Implementing and operating cisco security core technologies v1. A vulnerability in the cisco discovery protocol feature of cisco fxos software and cisco nxos software could allow an unauthenticated, adjacent attacker to execute arbitrary code as root or cause a denial of service dos condition on an affected device the vulnerability exists because of insufficiently validated cisco. One key disadvantage of the clientserver architecture is that the server can present a single point of failure.