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Interface - show interfaces counters explained

Media Access Control (MAC)

Physical layer - Copper medium

Physical layer - Optical fiber medium

Physical layer - Wireless medium

Physical layer - modem

Wireless - CSMA-CA

Wireless - Real-time and management functions


There are three types of media used for the transmission of data: 

* [Copper](/physical-layer-copper-medium)
* [Optical Fiber](/physical-layer-optical-fiber-medium)
* [Wireless](/physical-layer-wireless-medium)

## Links

https://networklessons.com/cisco/ccna-200-301//introduction-to-ethernet

https://networklessons.com/cisco/ccna-200-301/introduction-to-wireless-networks

Physical layer - media

OSPF in a GRE multipoint environment

OSPF loop prevention

OSPF message options field

OSPF metric sum of outgoing interface costs

OSPF modifying the router ID

OSPF network command

OSPF network types

OSPF non directly connected neighbor adjacencies

OSPF packet types

OSPF point to point network type for Ethernet

OSPF requirements for forming adjacency

OSPF router ID in an IPv6 environment

OSPF router ID

OSPF sham-link cost

OSPF sham-link

OSPF virtual link and ABRs

OSPF where do you configure a virtual link

OSPF why is a backbone area 0 necessary

OSPF within what area is an OSPF router considered to be

OSPF

OSPFv2 and OSPFv3 comparison

OSPFv3 - router ospfv3 command

OSPFv3 communication between routers and next hop addresses

OSPFv3 instance ID

Offset-list

PAT (overloading) maximum number of translations per inside global address

PAgP

PBR - Policy Based Routing

PBR - Transport Layer port number

PBR - load balancing

PBR - matching prefix lists

PBR - route-map and ACL deny statements not supported

PBR - set interface command

PBR next hop recursive

PBR next hop verify availability

PBR next-hop and default next-hop

PPPoE

PSTN

PTP - Best Master Clock Algorithm

PTP - Clock Types

PTP - Interface Roles

PTP - Offset and Delay times

PTP - Precision Time Protocol

Passive interface

Physical layer - carrier wave

Physical layer - encoding

Physical layer - modulation

Ping - Specify ToS

Ping - common reasons for failure

Ping - debug commands

Ping - extended feature

Ping - possible ping responses

Ping - specifying size

Ping - sweep range of sizes

Ping - troubleshooting concepts

Ping

PoE - Understanding Maximum Power

PoE Passive

PoE Standards-based

PoE over Gigabit Ethernet

PoE power sourcing equipment (PSE)

PoE powered device (PD)

PoE what is it

Point-to-Point Protocol (PPP)

Policy Based Routing acts on incoming traffic

Prefix Lists - Operators

Prefix Lists

Private VLANs - across a trunk

Private VLANs - non-operational type

Private WAN

Protocol Data Unit (PDU)

Protocol Independent Multicast (PIM)

Protocols with LFA support

Proxy ARP Best Practices

Pseudowire

Public Key Certificate

Python - Parsing output of show commands

Python - Performing Tasks Concurrently

Python - viewing code using trinket.io

Python Paramiko SSH

Python stdin, stdout, stderr

QOS - Multilayer Switch QoS (MLS)

QoS - Assured Forwarding PHB values

QoS - Bc and Be bucket sizes

QoS - CBWFQ

QoS - Classification by IP

QoS - CoS to DSCP and DSCP to CoS mapping

QoS - Hierarchical QoS

QoS - Jitter

QoS - LLQ applied only outbound

QoS - LLQ bandwidth configuration

QoS - LLQ priority commands

QoS - Nested policy maps

QoS - Policing command syntax

QoS - QoS Groups

Physical layer - media

Links

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