What is the cisco ios version that the switch is running. S1 is a layer 2 switch, so it makes forwarding decisions based on the layer 2 header. Cisco 350 series managed switches data sheet kommago. L2f is part of the layer 2 tunneling protocol l2tp standard rfc 2661. Switches and bridges are used for layer 2 switching.
The second level of the open system interconnection osi model is the data link layer. Aug 22, 2017 packet tracer layer 2 security topology. In this lab, you will configure ssh access and layer 2. Jul 11, 2019 media access control security or macsec is the layer 2 hop to hop network traffic protection. This technology enables a secure connection, over the internet, between the users.
The main purpose of this blog is to provide technical tutorials, configuration examples and guides about ip networks with focus on cisco products and technologies. 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. Manual image verification may be initiated from the cli using the verify command. Apr 05, 2008 we use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Up to 4094 vlans can be configured on cisco catalyst switches. As a result, switches can present a network security risk. L2tp layer 2 tunneling protocol l2tp is an ietf standard. Use the webex training center to share files and documents, hold online meetings and conferences, and foster online collaboration. Beginners will learn to understand the basics of how data is sent and received in a computer network and how small computer networks are created. Changing the way we work, live, play, and learn and cisco store are service. Security features on switches securing layer 2 cisco press. Lesson 76 c3pl cisco common classification policy language, class map, policy map and service policy. Ccna security 210260 official cert guide premium edition ebook and practice test the exciting new ccna security 210260 official cert guide, premium edition ebook and practice test is a digitalonly certification preparation product combining an ebook with enhanced pearson it certification practice test. What is bgp and bgp configuration explained cbt nuggets simplilearn provides online ccnp documentation training arranged with cisco designed audiovisual course content.
Private vlan edge pve provides layer 2 isolation between devices on the same vlan. Similar to routers, switches are subject to attack from malicious internal. Jul 24, 2018 ccna security 210260 section 8 securing layer 2 infrastructure. In a typical lan, all hosts are connected to one central device. Aug 22, 2017 packet tracer layer 2 vlan security topology. Network security is only as strong as the weakest link, and layer 2 is no exception. They break up one large collision domain into multiple smaller ones in a typical lan, all hosts are connected to one central device. Layer1 vlans q also known as port switching q can be used to provide security and isolation q does not allow user mobility. Cisco training and tutorials use the webex training center to share files and documents, hold online meetings and conferences, and foster online collaboration. Create a new management vlan vlan 20 and attach a management pc to that vlan. Cisco security experts omar santos and john stuppi share preparation hints and testtaking tips, helping you identify areas of weakness and.
In the earlier chapters, we discussed that many realtime security protocols have evolved for network security. After the initial assessment and gap analysis, the cycle continues with remediation planning, which has the goal of closing the gap and satisfying future requirements by updating the overall network architecture. Pdf securing layer 2 in local area networks researchgate. The network device must use snmp version 3 security model with fips 140 2 validated cryptography for any snmp agent configured on the device. Ccnp route, ccnp switch, and ccnp tshoot, each course is equivalent to 120 hours of instructions. Overview network security fundamentals security on different layers and attack mitigation. Welcome to the cisco ccna networking basics for beginners. Cisco ios xr virtual private network configuration guide for the cisco crs router ol2466901. About cisco networking tutorials networks training. Secure spanningtree parameters to prevent stp manipulation attacks. During pentests, yersinia is used to initiate attacks on layer 2 devices like switches, dhcp servers spanning tree protocols etc. The site was designed to help you pass the ccna exam 200125, but it can also be used as a reference site for anything networking related. Changing arp bindings requires manual intervention.
The cisco ccna security certification also provides the tools and skills needed for an it security beginner for installation, troubleshooting, and monitoring of network devices to maintain the integrity, confidentiality, and availability of. Whether you need a basic highperformance network to connect employee. Ccna security 210260 section 8 securing layer 2 infrastructure. My name is harris andrea and im a security and network engineer working in an internet service provider. Create a backdoor to allow future access, in case main point of attack entry is shutdown. When it comes to networking, layer 2 can be a very weak link. Lesson 78 how to configure cisco ios zone based firewall.
Understanding, preventing, and defending against layer 2. Understanding layer 2, 3, and 4 protocols searchnetworking. With the introduction of ciscos powerful switches and vlan feature, most companies started to deploy a switched network with vlans extending throughout the lan campus. Layer 2 risks reconnaissance packet capture use of tools such as wireshark to pull data off the wire. Network security baseline ol1730001 chapter 1 introduction cisco security framework overview. Yersinia for layer 2 kali linux tutorials, kali linux. Lesson 79 introduction to cisco ipsec vpn technologies. Ipsec, vpn, and firewall concepts computer science. Cisco recommends that vlans be localized to a switch, the switches at this level should have support for vlans for a variety of purposes. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Layer 2 switch security technical implementation guide cisco.
Protocols on one layer will interact with protocols on the layer above and below it, forming a protocol suite or stack. Demonstrate an understanding of the importance of network security. Without the strong authentication and privacy that is provided by the snmp version 3 userbased security model usm, an unauthorized user can gain. Layer 2 wan supports an enterprise subscriber model in which the service provider is transparent and the enterprise implements all layer 3 routing. Table b1 layer 2 protocols protocol description l2f layer 2 forwarding l2f creates network access server nasinitiated tunnels by forwarding pointtopoint ppp sessions from one endpoint to another across a shared network infrastructure. Pdf exploring layer 2 network security in virtualized. Next, she addresses layer 2 attacks and techniques to secure cisco switches. Security is important in our networks, at this layer, we can implemnent several security measures such as port security to control access to the network. Ethernet switching attack resilience varies widely from vendor to vendor. Wireless traffic analysissniffing launch wireless attacks.
May go through a router to access the old server lan segment 1 lan segment 4 lan segment 5 lan segment 2 lan segment 3 vlan 1 vlan 2. Candidates are expected to program and automate the network within their exam, as per exam topics below. These functions are controlled by protocols, which are rules that govern endtoend communication between devices. Just like ipsec protects network layer, and ssl protects application data, macsec protects traffic at data link layer layer 2. During pentests, yersinia is used to initiate attacks on layer2 devices like switches, dhcp servers spanning tree protocols etc. By default, only vlan 1 is configured on the switch, so if you connect hosts on an outofthebox switch they all belong to the same layer 2 continue reading. The curriculum is designed for students seeking career oriented, enterpriselevel networking skills. Layer 2 security network switch internet architecture. All attacks and mitigation techniques assume a switched ethernet network running ipv4. Here you can find all materials needed to study for your ccna exam. With our cisco tutorials, learn to set up, host, and manage webex sessions. The layer 2 infrastructure consists mainly of interconnected ethernet switches. Layer two forwarding l2f is a cisco tunneling protocol that uses virtual dialup networks for secure data packet transport. This allows for flexibility in the wan design and interconnection of the remote sites.
Layer 2 security free download as powerpoint presentation. Cisco security device manager the cisco security device manager sdm is an intuitive, webbased device management tool embedded within cisco ios access routers. Prep for the layer 2 technologies part of exam, 300115 switch implementing cisco ip switched networks. Thus a pentester can identify the vulnerabilities in the deep layer 2 of the network. This exam tests a candidates knowledge of implementing and operating core security technologies including network security, cloud. Network security fundamentals security on different layers and attack mitigation. Ccna security 210260 official cert guide cisco press. Lesson 17 cisco network foundation protection nfp framework management plane, control plane and data plane. Applying firstclass security measures to the upper layers layers 3 and higher does not benefit your network if layer 2 is compromised. The network device must use snmp version 3 security model with fips 1402 validated cryptography for any snmp agent configured on the device. Some ios version may require a manual shutdown command before entering the no shutdown. 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.
Cisco also published a white paper 8 regarding vlan security in their. 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. Introduction to ccna security free networking tutorials. Enable defended telnet admission to a router user interface, and accede application defended shell ssh instead of telnet. Objectives connect a new redundant link between sw1 and sw2.
There are no specific requirements for this document. The application layer layer 7 the presentation layer layer 6 the session layer layer 5 the transport layer layer 4 the network layer layer 3 the data link layer layer 2 the physical layer layer 1 putting all the layers together. Use the system steal data, cause denial of service etc. Network layer security controls have been used frequently for securing communications, particularly over shared networks such as the internet because they can provide protection for many applications at once without modifying them. Restrict infrastructure device management accessibility 23. However, the data link layer layer 2 security has not been adequately addressed yet. Macsec introduces a new tag field, security tag sectag, in layer 2 frames. The switch cisco ios software provides many security features that are specific to switch functions and protocols. Take advantage of this course called firewall security to improve your networking skills and better understand firewall this course is adapted to your level as well as all firewall pdf courses to better enrich your knowledge all you need to do is download the training document, open it and start learning firewall for free this tutorial has been prepared for the beginners to help. This is not a comprehensive talk on configuring ethernet switches for security or nac or ieee 802. The data link layer is adjacent to the physical layer, so they are associated pretty closely together. They break up one large collision domain into multiple smaller ones. Ccna security 210260 official cert guide ccna security 210260 official cert guide is a bestofbreed cisco exam study guide that focuses specifically on the objectives for the ccna security implementing cisco network security iins 210260 exam.
Whereas the physical layer deals with the actual physical media the cables and so forth that the data move over, the data link. Layer 2 switching or data link layer switching is the process of using devices mac addresses to decide where to forward frames. Ccna security 210260 official cert guide is a bestofbreed cisco exam study guide that focuses specifically on the objectives for the ccna security implementing cisco network security iins 210260 exam. Enable port security to prevent cam table overflow attacks. Perhaps the strongest driving force to deploying a layer 2 network was that layer 3 devices could not keep up with layer 2 switching engines. This course is designed for beginners who want to enter in the world of computer network. L2f functionality is similar to the pointtopoint tunneling protocol pptp, which was developed by the microsoftled pptp forum. Enable trunking and configure security on the new trunk link between sw1 and sw2. The cisco safe blueprint additionally lists several best practices for layer 3 security. Cisco security experts omar santos and john stuppi share preparation hints and testtaking tips, helping you identify areas of. This module provides the conceptual and configuration information for mpls layer 2 virtual private networks vpns on cisco ios xr software.
It consists of various layer2 attacks exploiting the weaknesses of different layer2 protocols. There have been a number of attacks on the network recently. Implementing and operating cisco security core technologies v1. Welcome to website, a free ccna tutorial site that closely follows the cisco ccna curriculum. Network security fundamentals security on different layers and attack mitigation cryptography and pki resource registration whois database. Objectives assign the central switch as the root bridge. Network models are organized into layers, with each layer representing a specific networking function. Understand how best to combat security issues and identify the tools software and hardware used. Identify the basic security threats and how to procedures to deal with them effectively. Layer 2 security features on cisco catalyst layer 3 fixed. Cisco switches offer a wide range of security features at layer 2 to protect the network traffic flow and the devices. Media access control security or macsec is the layer 2 hop to hop network traffic protection.
Essential lockdowns for layer 2 switch security techrepublic. Cisco ccna security notes 640553 m morgan 2010 page 8 of 56 6. Let us say you want a switch to be shown as a container with the switch in the middle and all the nodes that are connected to it. The cisco ccna security certification curriculum provides an introduction to the core security concepts. Configuring asa basic settings and firewall using cli duration. This post will deal with creating layer 2 vlans on cisco switches and performing all relevant configurations. In this paper, we discuss the security concerns in layer 2 and summarize some of the possible attacks in layer 2. Lesson 80 how to configure sitetosite ipsec vpn using ikev1 main mode. Most enduser devices, such as computers, printers, ip phones and other hosts, connect to the network via layer 2 access switches.
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