Cheat sheets, study guides, and practice tests built by engineers with real certifications.
It's 27 pages of CCNA 200-301 study notes with the Packet Tracer commands underneath every concept. All six exam domains: networking fundamentals, subnetting with the magic-number trick, VLANs and trunking, router-on-a-stick, STP, EtherChannel, static routing and OSPF, DHCP and NAT/PAT, ACLs and port security, wireless, and the automation topics.
It's 180 DevOps interview questions with short, say-it-out-loud answers, grouped by the tool the interviewer is holding. Built for anyone with a DevOps or platform engineer screen booked in the next two weeks.
This is a free 47-page PDF written by a working service provider network engineer, not a vendor marketing team. Every recommendation comes with the actual configuration, and most come in all three flavours: IOS, IOS-XE and IOS-XR side by side. If you're building an MPLS core, prepping for CCNP Service Provider, or you inherited a network someone else tuned badly, this is the reference you keep open in a second tab.
It's 50 CCNA-level interview questions with short, say-it-out-loud answers. OSI model, subnetting, VLANs and trunking, STP, DHCP and DNS, NAT and PAT, OSPF and BGP, ACLs, HSRP, QoS, and the troubleshooting questions that come up in every first-round screen. One question per block, one tight answer under it. Built for people walking into a junior network engineer or NOC interview in the next two weeks.
Free OSI model cheat sheet PDF. All 7 layers with functions, PDUs, devices and protocols, plus mnemonics and an OSI vs TCP/IP map.
It walks you through building a full Cisco SD-Access virtual lab for self-practice: Catalyst Center, ISE, and Catalyst 9000v switches running on EVE-NG and ESXi. You get the resource sizing, the topology, the connectivity map, and working config for the fusion router, NAT router, and border node. Built for CCNP Enterprise and CCIE candidates who want hands-on fabric practice without buying hardware.
It's a cheat sheet and a study guide in one. You get EIGRP from the ground up: how it picks a path, how DUAL works, the timers, the tables, authentication, and the config commands you'll actually type on a router. Written for CCNA and CCNP students, useful for anyone who touches Cisco routing.
Want the full lab as a free PDF? Download it now, no cost. It's a real 7-router BGP project you automate end to end with Python. No manual CLI. Grab the file, open GNS3, run one script, watch BGP converge across 4 autonomous systems.
Download a free BGP PDF guide. 148 pages on Border Gateway Protocol, from what is BGP to AS_PATH, eBGP vs iBGP, and path selection. Instant, no cost.
It's 27 pages of CCNA 200-301 study notes with the Packet Tracer commands underneath every concept. All six exam domains: networking fundamentals, subnetting with the magic-number trick, VLANs and trunking, router-on-a-stick, STP, EtherChannel, static routing and OSPF, DHCP and NAT/PAT, ACLs and port security, wireless, and the automation topics.
This is a free 47-page PDF written by a working service provider network engineer, not a vendor marketing team. Every recommendation comes with the actual configuration, and most come in all three flavours: IOS, IOS-XE and IOS-XR side by side. If you're building an MPLS core, prepping for CCNP Service Provider, or you inherited a network someone else tuned badly, this is the reference you keep open in a second tab.
It's 180 DevOps interview questions with short, say-it-out-loud answers, grouped by the tool the interviewer is holding. Built for anyone with a DevOps or platform engineer screen booked in the next two weeks.
It's 27 pages of CCNA 200-301 study notes with the Packet Tracer commands underneath every concept. All six exam domains: networking fundamentals, subnetting with the magic-number trick, VLANs and trunking, router-on-a-stick, STP, EtherChannel, static routing and OSPF, DHCP and NAT/PAT, ACLs and port security, wireless, and the automation topics.
It's 180 DevOps interview questions with short, say-it-out-loud answers, grouped by the tool the interviewer is holding. Built for anyone with a DevOps or platform engineer screen booked in the next two weeks.
This is a free 47-page PDF written by a working service provider network engineer, not a vendor marketing team. Every recommendation comes with the actual configuration, and most come in all three flavours: IOS, IOS-XE and IOS-XR side by side. If you're building an MPLS core, prepping for CCNP Service Provider, or you inherited a network someone else tuned badly, this is the reference you keep open in a second tab.
It's 50 CCNA-level interview questions with short, say-it-out-loud answers. OSI model, subnetting, VLANs and trunking, STP, DHCP and DNS, NAT and PAT, OSPF and BGP, ACLs, HSRP, QoS, and the troubleshooting questions that come up in every first-round screen. One question per block, one tight answer under it. Built for people walking into a junior network engineer or NOC interview in the next two weeks.
Free OSI model cheat sheet PDF. All 7 layers with functions, PDUs, devices and protocols, plus mnemonics and an OSI vs TCP/IP map.
It walks you through building a full Cisco SD-Access virtual lab for self-practice: Catalyst Center, ISE, and Catalyst 9000v switches running on EVE-NG and ESXi. You get the resource sizing, the topology, the connectivity map, and working config for the fusion router, NAT router, and border node. Built for CCNP Enterprise and CCIE candidates who want hands-on fabric practice without buying hardware.
