Here are the step by step configuration of implementing Access-Lists or ACL on Cisco routers such as ASR9000 running on IOS-XR, utilizing the object-group for simplicity and convenience. 1.Create object-group object-group network ipv4 allowed_ip 192.168.0.0/24 object-group port allowed_port eq ssh 2. Create ACL ipv4 access-list ACL88 10 permit tcp net-group allowed_ip any port-group allowed_port 20 deny tcp any any port-group allowed_port 30 permit ipv4 any any 3. Apply ACL interface Te0/0/0/0 ipv4 access-group ACL88 egress Verification: show object-group network ipv4…
Tag: <span>network</span>
OSI or Open Systems Interconnection model consists of 7 Layers that describes how telecommunication or computing systems use to communicate or operate over a network. It was the first standard model for network communications and still widely used for network isolation and troubleshooting. Layers Functions / Applications Data Types Examples (7) Application End User / Desktop-Mail Services-Directory Services-Network Virtual Terminal-File transfer access/management Data HTTP,SMTP,FTP,SSH,DNS,Telnet,IMAP,POP3,LDAP,HTTPs,TFTP (6) Presentation Syntax/ Data Representation-Translation-Encryption/Decryption (plain to cipher text)-Compression Data ASCII,JPEG,MPEG,GIF,EBDIC (5) Session Dialog Coordination-Session establishment/maintenance/termination-Synchronization-Dialog…
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