A companion guide cg is the fullfeatured textbook that supports a cisco. The vulnerability is due to insufficient validation of l2tp packets. Without the strong authentication and privacy that is provided by the snmp version 3 userbased security model usm, an unauthorized user can gain. Ccna cybersecurity operations companion guide cisco press. Traffic traversing the firewall is examined, as per policies, providing increased security and visibility within the internal network. The vulnerability is due to the incorrect handling of a transport layer security tls extension during tls connection setup for the affected.
Configuring the cisco ise to allow the sgacls to be downloaded. From the layer 2 security dropdown list, choose 802. The tcpip application layer performs the functions of the upper three layers of the osi model. Amazon aws security aws offers you the ability to add an additional layer of security to your data at rest in the cloud, providing scalable and efficient encryption features.
All networks within the same security domainzone route internally on a core device e. Network security checklist cisco layer 2 switch 19. Ciscos layer 2 forwarding protocol l2f and microsofts pointtopoint tunneling protocol pptp. Refer to cisco technical tips conventions for more information on document conventions. Portbased security basically says that we wont let you on our layer 2 switch infrastructure, even if you plug into a port, until you prove who you. Vlan security white paper cisco catalyst 6500 series switches. May 27, 20 port security is used to secure the port of a layer 3 switch for the purpose of to not access that port except the dedicated mac address computer, or when some violate that restriction the switch port must be off.
However, the data link layer layer 2 security has not been adequately. Cisco ios software layer 2 tunneling protocol l2tp denial of service vulnerability date. Jun 25, 2009 portbased security basically says that we wont let you on our layer 2 switch infrastructure, even if you plug into a port, until you prove who you are and that youre authorized to get onto the. However, switches and layer 2 of the osi reference model in general, are. Dec 17, 2014 a list of best practices is presented here for implementing, managing, and maintaining secure layer 2 network. Create a backdoor to allow future access, in case main point of attack entry is shutdown. Configuring layer 3 security configuringlayer3securityusingwebauthentication,page1 configuring layer 3 security using web authentication prerequisites for. Apr 17, 2020 choose the security and layer 2 tabs to open the wlans edit security layer 2 page. Vulnerability the iaonso will ensure when an authentication server is used for administrative access to the device, only one account is defined.
This document provides the design and deployment of the cisco sdwan security infrastructure specific to the compliance use case within remote sites running iosxe sdwan wan edge platforms. This exam tests a candidates knowledge and skills related to network fundamentals, network access, ip connectivity, ip services, security fundamentals, and automation and programmability. Network security is not only concerned about the security of the computers at each end of the communication chain. Have you any ccna and ccna security and network security books in hindi rahul august, 2017 at 9. He has more than 20 years of experience in computer networking and security. The network element must use snmp version 3 security model with fips 140 2 validated cryptography for any snmp agent configured on the device.
Understanding layer 2 encryption the newberry group. Ccna security 210260 section 8 securing layer 2 infrastructure. Custom data select yes if you want to provide a bootstrap configuration file for the cisco csr v for further information about providing a bootstrap configuration file for the cisco csr v, see. Cisco ios and ios xe software layer 2 tunneling protocol. Port security is used to secure the port of a layer 3 switch for the purpose of to not access that port except the dedicated mac address computer, or. I have configured a cisco wlc to authenticate users using external web authentication at layer 3. Layer 3 switch and security appliance best practices for vlans. One thing i dont cover in this video is setting a static mac address for security, so ill do it here. The security features leveraged within this guide include enterprise firewall with application awareness and intrusion prevention system ips.
A list of best practices is presented here for implementing, managing, and maintaining secure layer 2 network. Preparing to download or upload a configuration file by using tftp b10. The network device must use snmp version 3 security model with fips 1402 validated cryptography for any snmp agent configured on the device. In this lab, you will configure ssh access and layer 2 security for s1 and s2. The recommended use case for the mx security appliance in passthrough mode is when it is acting as a vpn concentrator for the cisco meraki auto vpn feature. One thing i dont cover in this video is setting a static. 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. Layer 2 security features on cisco catalyst layer 3 fixed. Implementing and operating cisco security core technologies v1. Layer 2 switch security technical implementation guide cisco. The network element must use snmp version 3 security model with fips 1402 validated cryptography for any snmp agent configured on the device.
Network security checklist cisco layer 2 switch version 7, release 1. Cisco systems product security incident response team to. Solved encryption on cisco switches over layer 2 ethernet. This factfilled quick reference allows you to get allimportant information at a glance, helping you to focus your study on areas of weakness and to enhance memory retention of important concepts. Figure 5 shows how the tag is inserted into the layer 2 frame. Layer 2 risks reconnaissance packet capture use of tools such as wireshark to pull data off the wire. Cisco en validated design and deployment guides cisco community. Aug 04, 2014 i have three sites that are connected to each other with a layer 2 ethernet provider in a mesh configuration. Layer 2 security network switch internet architecture. Cisco switches layer 2 security best practices it tips. Apr 05, 2008 we use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Choose the layer 3 tab to open the wlans edit security layer 3 page. Network security entails protecting the usability, reliability, integrity, and safety of network and data. I have three sites that are connected to each other with a layer 2 ethernet provider in a mesh configuration.
An attacker could exploit this vulnerability by sending a crafted l2tp packet to an affected device. The network device must use snmp version 3 security model with fips 140 2 validated cryptography for any snmp agent configured on the device. Ccie collaboration quick reference provides you with detailed information, highlighting the key topics on the latest ccie collaboration v1. Cisco firepower system software transport layer security.
Requires vlan to mac database which is downloaded via tftp to the vmps. The cn series encryptors latency and overhead are the lowest in the marketplace. Default layer 2 ethernet interface vlan configuration 1216. This article was originally written by chris partsenidis on behalf of.
Catalyst 2960 switch software configuration guide full. Pedagogy has been added to enhance comprehension and retention. L3 switch networks of a different security domainzone route via a security gateway. So unless one of your vlans needs isolating then keep as you are. A vulnerability in the detection engine of cisco firepower system software could allow an unauthenticated, remote attacker to restart an instance of the snort detection engine on an affected device, resulting in a brief denial of service dos condition. Sometimes network engineers fight with enabling bpdu guard due to. Security configuration guide, cisco ios release 15. In layer 2 deployment mode the firewall is configured to perform switching between two or more network segments. Palo alto next generation firewall deployed in layer 2 mode. 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. Configuring ip source guard for static hosts on a layer 2 access port 253.
Deploying a cisco csr v vm on microsoft azure using a day 0 bootstrap file and customdataexamples. Mar 18, 2015 cisco pdf, ccna exploration, packet tracer free download, ccna v5 question, cisco configuration tool, ccna v5 answer, ccna exam v5, cisco access list, cisco ospf, ccna 4 final exam, ccna 3 final exam, ccna exam questions, cisco certification login, software free download, download software free. Implement secure network management and reporting use cli and sdm to configure ssh on cisco routers to enable secured management access use cli and sdm to configure cisco routers to send syslog messages to a syslog server mitigate common layer 2 attacks describe how to prevent layer 2 attacks by configuring basic catalyst switch security. Cisco s layer 2 forwarding protocol l2f and microsofts pointtopoint tunneling protocol pptp. When it comes to networking, layer 2 can be a very weak link. Cloud security and osi layer 2 the layer oft forgotten. A new version of this protocol, l2tpv3, appeared as proposed standard rfc 3931 in 2005. Pdf exploring layer 2 network security in virtualized. Are client wifi connections more resilient against eavesdroppers with a preshared key at layer 2 versus simply having an open network and just using layer 3 web auth. A single broadcast storm can cripple a 10gigabit network in a matter of seconds. Cisco wireless controller configuration guide, release 7.
Passthroughvpn concentrator mode ensures easy integration into an existing network that may already have layer 3 functionality and edge security in place. Essential lockdowns for layer 2 switch security techrepublic. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Application layer protocols help exchange data between programs running on the source and destination hosts. Cisco also published a white paper 22 regarding vlan security in their catalyst series of switches.
This article is also available for download in pdf format here. The switch cisco ios software provides many security features that are specific to switch functions and protocols. Choose the security and layer 2 tabs to open the wlans edit security layer 2 page. Sometimes network engineers fight with enabling bpdu guard due to the nature of its operation. All dynamic secure addresses are downloaded by the new stack. Each site has a cisco 3560 switch that connects to the providers network on fa01. Companion guides are portable references designed to reinforce online course material, helping students enrolled in a cisco networking academy course of the same name focus on important concepts and organize their study time for quizzes and exams. For more information on vlan network, readers and visit our dedicated vlan network section. The application layer acts as interface between the applications and the underlying network. Cisco ccna security notes 640553 m morgan 2010 page 8 of 56 6. Layer 2 security free download as powerpoint presentation. Restrict infrastructure device management accessibility 23. Preventing layer 2 loops with bpdu guard free ccna workbook.
Restrict management access to the switch so that untrusted networks are not able to exploit management interfaces. Ethernet, synchronous optical network sonet and fibre channel networks at data speeds up to 10 gigabits per second gbps. Background information similar to routers, both layer 2 and layer 3 switches have their own sets of network security requirements. Switches are susceptible to many of the same layer 3 attacks as routers. If using snmpv3 recommended, enforce an snmp view that restricts the download of full ip routing. Ccna cybersecurity operations companion guide is the official supplemental textbook for the cisco. Video showing how to setup and view basic configurations and port security on cisco switches. Deny queries that request to download the full ip routing and arp tables using snmp views. For example, use ssh, authentication mechanism, access list, and set privilege levels. One of the biggest security threats to any network not because of an intrusion but because of an outage is from layer 2 spanningtree loops. Cisco switches layer 2 security best practices it tips for. Data encryption capabilities key management services hsm available aws provides apis for you to integrate encryption and data protection with any of.
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