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Asad Ijaz

My Name is Asad Ijaz Khattak and I am the writer and blogger, known for my website "". I have writes about various topics related to technology, networking, and cybersecurity. I am also a Cisco Certified Network Professional (CCNP) and Cisco Certified Network Associate (CCNA). I have written several articles and tutorials on the website which can be used as a learning resource for people interested in networking and cybersecurity. I am the member and Editor of Proudly Team NetworkUstad


  1. ACL Operation » Networkustad
    September 2, 2019 @ 10:50 am

    […] I discuss the Access Control List (ACL) in my previous articles that it is a technique used for monitoring outgoing traffic as well as […]


  2. IPv4 ACLs Types – Cisco Routers » Networkustad
    September 2, 2019 @ 1:25 pm

    […] are many different IPv4 ACLs types, for example, access control lists for IP version 4, for IP version 6, for IPX, for DECnet, […]


  3. Wildcard Masking – ACL » Networkustad
    September 2, 2019 @ 3:01 pm

    […] ACLsWildcard Mask is a string of 32 binary digits used by the router to determine which bits of the address to examine for a match. We use wildcard masking in several places, for example: To indicate the size of a network or subnet for some routing protocols, such as OSPF. The IPv6 ACLs uses prefix-length to indicate how much of an IPv6 source or destination address should be matched. […]


  4. General Guidelines for Creating ACLs » Networkustad
    September 2, 2019 @ 3:16 pm

    […] Access Control List (ACL) configuration is not an easy task. There may be multiple policies required to manage the type of traffic allowed to enter or exit to the interface. Suppose we have a router with two interfaces. Both interfaces configured with IPv4 and IPv6. If we required ACLs for both IPv4 and IPv6, on both interfaces and in both directions (inbound and outbound), each interface required four ACLs, one ACL for IPv4, one ACL for IPv6, one ACL for inbound traffic and one ACL for outbound traffic. […]


  5. Standard and Extended ACL Placement » Networkustad
    September 2, 2019 @ 4:43 pm

    […] ACL should be placed where it has the greatest impact on efficiency. Improper implementation causes […]


  6. ACL Statistics » Networkustad
    September 10, 2019 @ 2:38 pm

    […] ACL has configured and applied to an interface and block some traffic then we can check the statistics […]


  7. Extended ACLs » Networkustad
    September 21, 2019 @ 4:13 am

    […] number of extended ACLs starts from 100 to 199 and 2000 to 2699, providing a total of 799 possible extended numbered ACLs. […]


  8. Inbound and Outbound ACL Logic » Networkustad
    September 21, 2019 @ 4:26 pm

    […] a router receives a packet the router start comparing the information in packet header with the ACL, If packet header information and an ACL entry match, the rest of the entries in ACLs are skipped, […]


  9. Troubleshooting Common ACL Errors » Networkustad
    September 22, 2019 @ 10:21 am

    […] can troubleshoot the ACL error using the show commands as we discussed earlier. The wrong order ACEs are the most common […]


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