By Jeremy Stretch · PacketLife.net
PacketLife Networking Cheat Sheets
These cheat sheets were created by Jeremy Stretch and published at PacketLife.net. They're shared here exactly as originally published: unmodified, with the author's credit on every sheet. They aren't Ellington Technologies work, and all rights stay with the author.
Most were published between 2010 and 2014, so some commands, software versions, and technologies have changed or been retired since. Check current vendor documentation before relying on them in production.
Each preview image is a reduced copy of the original PDF's first page, shown to help you find a sheet. The pages shown are Jeremy Stretch's work.
Every link below opens or downloads a PDF stored on this site. None of them are affiliate links. Original PacketLife library (archived copy).
IPv4, IPv6, and subnetting
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IPv4 Subnetting
Address classes, CIDR prefixes and masks, RFC 1918 private ranges, and a subnet-size table for VLSM.
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IPv6
Header fields, address types and reserved prefixes, EUI-64 interface IDs, and transition mechanisms.
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IPv4 Multicast
Multicast address ranges, IGMP and CGMP, PIM, and rendezvous point (RP) discovery.
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NAT
Network address translation terms and Cisco IOS configuration examples.
VLANs and switching
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VLANs
Access and trunk ports, 802.1Q and ISL tagging, trunk negotiation, and switched virtual interfaces.
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Spanning Tree
STP, PVST and Rapid PVST: BPDUs, port roles and states, and IOS configuration.
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First Hop Redundancy
HSRP, VRRP, and GLBP compared, with Cisco IOS configuration for each.
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IEEE 802.1X
Port-based access control: supplicant, authenticator and RADIUS roles, EAP and EAPOL, and switch configuration.
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IEEE 802.11 WLAN
802.11 standards and modulation, channels and regulatory domains, BSS and ESS terms, and frame types.
Routing protocols
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BGP
Attribute types, the path selection process, and Cisco IOS configuration examples.
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EIGRP
DUAL terminology, metric weights (K values), and Cisco IOS configuration.
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OSPF
LSA and area types, DR/BDR election, network types, and Cisco IOS configuration.
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IS-IS
Levels, NSAP addressing, PDU types, and Cisco IOS configuration.
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RIP
RIPv2 and RIPng timers, authentication, and Cisco IOS configuration.
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Interior Gateway Protocols (wall poster)
RIP, EIGRP, OSPF, and IS-IS side by side, with IOS configuration. Published as a 36 × 24 inch wall poster.
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Frame Mode MPLS
Labels, LDP, the LFIB, and provider and customer edge roles, with IOS configuration.
Cisco IOS and network security
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IOS IPv4 Access Lists
Access list numbering, wildcard masks, and standard and extended ACL syntax.
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IOS Zone-Based Firewall
Security zones, class maps, policy maps, and zone pairs.
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IPsec
ESP and AH, IKE (ISAKMP) phases, encryption and hash options, and IOS configuration.
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Cisco IOS Versions
How IOS release numbers and trains were named, and lifecycle milestones (EOS, EOE, EOL).
Packet analysis and troubleshooting
Other networking references
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Common Ports
Well-known TCP and UDP port numbers for common services.
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Physical Terminations
Copper and fiber connectors, serial connectors, and transceiver types.
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PPP
PPP phases, LCP options, PAP and CHAP authentication, and IOS configuration.
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QoS
QoS models, DSCP and IP precedence markings, queuing, and congestion avoidance (WRED).
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VoIP Basics
Voice VLANs, PoE classes, codecs, and signaling protocols such as SIP and MGCP.
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Markdown
Markdown syntax for headings, emphasis, lists, links, and code (not networking, but part of the set).
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MediaWiki
MediaWiki markup for formatting, links, and tables (not networking, but part of the set).