Ethernet administrative and operational encapsulation

Switchport - IEEE 802.1q

Switchport trunk encapsulation


Inter-Switch Link or ISL is a Cisco proprietary protocol that maintains [VLAN](/vlan) information on [Ethernet](/ethernet) frames that traverse a [trunk](/switchport-trunk) link between switches

ISL is a type of [trunk encapsulation](/switchport-trunk-encapsulation) that adds a VLAN ID to the [Ethernet header](/ethernet-header).  It is no longer available in newer switches and has been largely superseded by the [IEEE 802.1Q](/switchport-ieee-8021q) standard.


Switchport - ISL

Security - storm control algorithm

Security IKE policy hash command

Security Trusted Platform Module (TPM)

Security aaa new-model

Security authentication on VTY lines

Security keyrings

Segment Routing

Serial - Data Communication Equipment (DCE)

Serial - Data Terminal Equipment(DTE)

Serial - Link between two routers

Serial Interface - Clock Rate

Serial Interface default broadcast address

Session Border Controller

Session Initiation Protocol

Show open TCP-UDP ports on Cisco router

Spanning Tree Portfast Configuration Options

Spanning Tree Protocol (STP)

Spine and leaf architecture - connections to leaf switches

Spine and leaf architecture - connections to spine switches

Spine and leaf architecture - reducing latency

Split-horizon

StackWise - IOS upgrade switch reboot sequence

StackWise Virtual

Stackwise - IOS install mode vs bundle mode

Stackwise election process

Stackwise user priority

Static ARP entry for own IP address

Subscriber templating

Summarization

Supernetting

Switch High Availability and the Control Plane

Switch configuring a routed port

Switch high availability options

Switch protected port limitations

Switch protected port

Switched Virtual Interface (SVI)

Switching -  CEF Adjacency Table

Switching - CEF

Switching - Media Access Control (MAC) addresses

Switching - Process switching

Switching - backplane

Switching - cut through

Switching - fast switching

Switching - show cable-diagnostics

Switching - store and forward

Switching - switch fabric

Switching - switchport autostate command

Switching

Switchport - show vlan internal usage

Switchport access

Switchport modes

Switchport trunk configuration ignores access commands

Switchport trunk

Symmetric Digital Subscriber Line (SDSL)

Syslog - Logging buffered command

Syslog - logging discriminator

Syslog - terminal monitor

Syslog relay or proxy

Syslog severity levels

Syslog

TCP - Congestion control

TCP - Determining the MSS

TCP - Header

TCP - SEQ and ACK values

TCP - Slow start

TCP - Three-way handshake

TCP - Urgent pointer field

TCP - Window Size Scaling

TCP - factors affecting segment size

TCP - role of checksum field

TCP IP Model

TCP MSS and window size

TCP RST flag

TCP SYN timeout

TCP header options

TCP phantom byte

TFTP

Tcl Shell

Telnet

Time to live

Time-based Access List (ACL) on Cisco IOS XR

Traceroute - Interpreting output

Traceroute asterisk and !H responses

Traditional Layer 2 Issues in VXLAN Networks

Transparent Cisco IOS Firewall use cases

Transport Layer port number

Troubleshooting - using Telnet to test transport layer ports

Troubleshooting Route Flapping on Cisco IOS

Troubleshooting a slow network

Troubleshooting high CPU and memory usage on a switch

UDP - Header

UDP - Maximum Datagram Size

Unicast Reverse Path Forwarding (uRPF)

Unicast traffic

Unknown unicast traffic

Switchport - ISL

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