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You're reading from  Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide

Product typeBook
Published inNov 2020
PublisherPackt
ISBN-139781800208094
Edition1st Edition
Tools
Cisco UCS
Concepts
Network Security
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Author (1)
Glen D. Singh
Glen D. Singh
author image
Glen D. Singh

Glen D. Singh is a cybersecurity author, educator and SecOps professional. His areas of expertise are cybersecurity operations, offensive security tactics and techniques, and enterprise networking. He holds a Master of Science (MSc) in cybersecurity and many industry certifications from top awarding bodies such as EC-Council, Cisco, and Check Point. Glen loves teaching and mentoring others while sharing his wealth of knowledge and experience as an author. He has written many books, which focus on vulnerability discovery and exploitation, threat detection, intrusion analysis, incident response, network security, and enterprise networking. As an aspiring game changer, Glen is passionate about increasing cybersecurity awareness in his homeland, Trinidad and Tobago.
Read more about Glen D. Singh

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Working with extended ACLs

Extended ACLs are sometimes the preferred choice as they allow you to filter specific traffic types compared to standard ACLs. Extended ACLs use the following range of numbers:

  • 100 to 199
  • 2000 to 2699

To create a numbered extended ACL on a Cisco IOS router, use the global configuration access-lists command, followed by a number within the range of 100 to 199 or 2000 to 2699 on the device.

Creating a numbered extended ACL

The following is the full syntax used to create a numbered extended ACL:

Router(config)# access-list access-list-number [ deny | permit | remark ] protocol [source source-wildcard] [operator port] [port-number or name] [destination destination-wildcard] [operator port] [port-number or name]

The following is a description of the new syntax used within an extended ACL:

  • protocol: Specifies the protocol type, such as IP, ICMP, TCP, and UDP.
  • operator: Used to compare the source or destination ports....
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Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide
Published in: Nov 2020Publisher: PacktISBN-13: 9781800208094
© 2020 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Glen D. Singh

Glen D. Singh is a cybersecurity author, educator and SecOps professional. His areas of expertise are cybersecurity operations, offensive security tactics and techniques, and enterprise networking. He holds a Master of Science (MSc) in cybersecurity and many industry certifications from top awarding bodies such as EC-Council, Cisco, and Check Point. Glen loves teaching and mentoring others while sharing his wealth of knowledge and experience as an author. He has written many books, which focus on vulnerability discovery and exploitation, threat detection, intrusion analysis, incident response, network security, and enterprise networking. As an aspiring game changer, Glen is passionate about increasing cybersecurity awareness in his homeland, Trinidad and Tobago.
Read more about Glen D. Singh

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