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Jun 15, 2022 · This report presents best practices for overall network security and protection of individual network devices. It will assist administrators in preventing an adversary from exploiting their...
- Trademark Acknowledgments
- Feedback Information
- Dedications
- Acknowledgments
- Command Syntax Conventions
- Foreword
- Introduction
- Goals and Methods
- Who Should Read This Book
- How This Book Is Organized
- Port-Level Traffic Controls
- Storm Control
- Protected Ports (PVLAN Edge)
- Port Blocking
- Port Security
- Access Lists on Switches
- Port ACL
- VLAN ACL (VACL)
- Spanning Tree Protocol Features
- Bridge Protocol Data Unit (BPDU) Guard
- Root Guard
- EtherChannel Guard
- Rate Limiting Incoming ARP Packets
- ARP Validation Checks
- Control Plane Policing (CoPP) Feature
- Step 4
All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capital-ized. Cisco Press or Cisco Systems, Inc., cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark.
At Cisco Press, our goal is to create in-depth technical books of the highest quality and value. Each book is crafted with care and precision, undergoing rigorous development that involves the unique expertise of members from the professional technical community. Readers’ feedback is a natural continuation of this process. If you have any comments ...
This book is dedicated to my beloved wife, Farah. Without her support and encouragement, I could not have completed this book.
would like to thank my family for all their continuous support and encouragement, and especially my father, Asghar Bhaiji, for his wisdom. Last but not least, I reminisce about my mother, Khatija Bhaiji, whose love is ever shining on me. would like to especially thank the technical reviewers, Nairi Adamian, Gert DeLaet, and Kevin Hofstra, who have ...
The conventions used to present command syntax in this book are the same conventions used in the IOS Command Reference. The Command Reference describes these conventions as follows: Boldface indicates commands and keywords that are entered literally as shown. In actual config-uration examples and output (not general command syntax), boldface indica...
With the explosion of the Internet economy, the continuous availability of mission-critical systems has never been more important. Network administrators through to business managers are expected by their customers, employees, and suppliers to provide constant network resource availability and access to critical applications and data in a completel...
The Internet was born in 1969 as the ARPANET, a project funded by the Advanced Research Projects Agency (ARPA) of the U.S. Department of Defense. The Internet is a worldwide collection of loosely connected networks that are accessible by individual computers in varied ways, such as gateways, rout-ers, dial-up connections, and through Internet servi...
Cisco Network Security Technologies and Solutions is a comprehensive all-in-one reference book that covers all major Cisco Security products, technologies, and solutions. This book is a complete reference that helps networking professionals understand and implement current, state-of-the-art security technol-ogies and solutions. The coverage is wide...
Whether you are a network engineer or a security engineer, consultant, or andidate pursuing security certifications, this book will become your primary reference when designing and building a secure net-work. Additionally, this book will serve as a valuable resource for candidates preparing for the CCIE Security certification exam that covers topic...
This book is meant to complement the information already available on Cisco.com and in the Cisco security products documentation. The book is divided into five parts, mapping Cisco security technologies and solutions into five key elements. Part I, “Perimeter Security”: This element provides the means to control access to critical network applicati...
Port-based traffic control features can be used to provide protection at the port level. Catalyst switches offer Storm Control, Protected Ports, Private Virtual Local Area Network (PVLAN), Port Blocking, and Port Security features.
A LAN storm typically occurs when hostile packets are flooded on the LAN segment, creating unnecessary and excessive traffic resulting in network performance degradation. Several factors can cause a storm on a network; examples include errors in the protocol-stack implementation or a loophole that is exploited in a device configuration. The Storm C...
In some network environments, there is a requirement for no traffic to be seen or forwarded between host(s) on the same LAN segment, thereby preventing interhost communications. The PVLAN edge feature provisions this isolation by creating a firewall-like barrier, thereby blocking any unicast, broadcast, or multicast traffic among the protected port...
When a packet arrives at the switch, the switch performs a lookup for the destination MAC address in the MAC address table to determine which port it will use to send the packet out to send on. If no entry is found in the MAC address table, the switch will broadcast (flood) unknown unicast or multicast traffic out to all the ports in the same VLAN ...
Port security is a dynamic feature that prevents unauthorized access to a switch port. The port security feature can be used to restrict input to an interface by identifying and limiting the MAC addresses of the hosts that are allowed to access the port. When secure MAC addresses are assigned to a secure port, the switch does not forward packets wi...
The switch supports the following four types of ACLs for traffic filtering: Router ACL Port ACL VLAN ACL MAC ACL
Port ACLs are similar to Router ACLs but are supported on physical interfaces and configured on Layer 2 interfaces on a switch. Port ACL supports only inbound traffic filtering. Port ACL can be configured as three type access lists: standard, extended, and MAC-extended. Processing of the Port ACL is similar to that of the Router ACLs; the switch ex...
VLAN ACL (also called VLAN map) provides packet filtering for all types of traffic that are bridged within a VLAN or routed into or out of the VLAN. Unlike Router ACL, VACL is not defined by a direction (input or output). All packets entering the VLAN (bridged or routed) are checked against the VACL. It is possible to filter traffic based on the di...
Spanning Tree Protocol (STP) resolves redundant topologies into loop-free, treelike topologies. When switches are interconnected via multiple paths, STP prevents loops from being formed. An STP loop (or forwarding loops) can occur when the entire network fails because of a hardware failure, a configuration issue, or a network attack. STP loops can ...
Bridge protocol data units (BPDU) are data messages exchanged between bridges using spanning tree protocol to detect loops in a network topology. BPDU contains management and control data information that is used to determine the root bridge and establish the port roles—for example: root, designated, or blocked port. The BPDU Guard feature is desig...
In a switched network environment with shared administrative control or in a service provider (SP) environment where there are many connections to other switches (into customer networks), it is important to identify the correct placement of the root bridge. If possible, it is also important to identify a specific predetermined location to achieve a...
The EtherChannel Guard feature is used to detect EtherChannel misconfigurations between the switch and a connected device. An example of a misconfiguration is when the channel parameters are not identical and do not match on both sides of the EtherChannel. Another example could be when only one side is configured with channel parameters. EtherChann...
Because the switch CPU performs the DAI, there is a potential for an ARP flooding denial-of-service (DoS) attack resulting in performance degradation. To prevent this, ARP packets can be rate limited using the ip arp inspection limit command from the interface configuration mode to limit the rate of incoming ARP requests and responses. By default, ...
Specific additional checks can be performed on incoming ARP packets to validate the destination MAC address, the sender IP address in ARP requests, the target IP address in ARP responses, or the source MAC address. Use the ip arp inspection validate {[src-mac] [dst-mac] [ip]} command from the global configuration mode to enable these additional ARP...
The traffic managed by a device can be divided into three functional components or planes: Data plane Management plane Control plane The vast majority of traffic flows through the device via the data plane; however, the route processor handles certain traffic, such as routing protocol updates, remote-access services, and network management traffic ...
Hostname(config)# control-plane Apply QoS policy configured to the control plane. Hostname(config-cp)# service-policy {input | output} {service_policy_name} NOTE The CoPP feature is also available as part of the integrated Network Foundation Protection (NFP) security features on the Cisco ISR (Integrated Services Router) platforms.
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Mar 31, 2023 · We outline the best practices and practical approaches organizations can take to improve their network security, including implementing security policies and procedures, using encryption and ...
Jun 18, 2024 · This report provides an overview of modern approaches to network access security for executive leaders, network defenders of critical infrastructure, and government organizations. The report is specifically intended for organizations wanting to shift from traditional broad remote access deployments and move
security function-specific to a security framework to a comprehensive security infrastructure that provides a holistic set of security services. Specific areas addressed include: • Feature enhancements to traditional network security appliances • Secure enterprise networking configurations for specific security functions
methods and tools that can be used to secure your network from these threats. The following topics will be covered in this chapter: The top 10 network attacks and how to fix them
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system and network security controls requires new, flexible yet robust solutions from reliable sources. This eBook presents some of the top tools and techniques that you will need to deal with the most relevant threats to your network. The following pages explore some relevant data, gathered by Niagara
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related to: what are the tools & strategies used in network security pdfProtect Your Data and Use AI for All Business Functions, Knowing Sensitive Data is Secure. Embrace Game-Changing Technology of AI for Cybersecurity to Transform the Way You Work.
Download the network security guide: Six Challenges to Securing the Modern Network. Darktrace/Network helps scale operations to keep up with threats & prevent more attacks.
