<Jeremy's IT Lab> Day 23: Ethernet Channel

Ethernet Channel prob: oversubscription (speed lower, can't use multi interface because of STP)sol: Ether channel (= Port channel , = LAG(link aggregation group))=> multiple interface to act single interface, treat this group as single interface - PAgP(Port Aggregation Protocol) -> IEEE 082.3ad- LACP(Link Aggregation Control Protocol) -> Cisco=> PAgP & LACP Dynamically negotiate create/maintena..

STP Status:Blocking: (Non- designated port)Listening: 15 sec by default (can be changed by Forward Delay Timer), (Root/ Designated Port)Learning: 15 sec by default (can be changed by Forward Delay Timer), (Root/ Designated Port) Forwarding: (Root/ Designated Port)Disabled: all XSTP Port StateSend/ Receive BPDUsFrame forwarding(reg traffic)MAC Address learningStable/TransitionalBlockingNO/ YESNON..

STP (Spanning Tree Protocol)- classic STP (802.1D - IEEE)- rapid STP Reason of using STP:Prob1: Broadcast Storms- Switches connected redundancy as security, switches forward infinitely broadcasting frames through trafficProb2: MAC Address Flapping- Also switch use source MAC address field to 'learn' MAC and update its table as much as they can STP:-> Prevents loop in bridged NW-> all vendor's sw..

더보기Network Fundamentals (20%)1.1 Explain the role and function of network components1.1.a Routers1.1.b Layer 2 and Layer 3 switches1.1.c Next-generation firewalls and IPS1.1.d Access points1.1.e Controllers (Cisco DNA Center and WLC)1.1.f Endpoints1.1.g Servers1.1.h PoE1.2 Describe characteristics of network topology architectures1.2.a Two-tier1.2.b Three-tier1.2.c Spine-leaf1.2.d WAN1.2.e Small..

DPT, VTP(removed scope from CCNA test) DTP:-> Cisco proprietary protocol allows Cisco switches to dynamically determine their interface status(access/ trunk) without manual configuration-> enabled by default on all Cisco switch interfaces-> manual config is recommand (security)-> dynamic desirable mode actively try to form a trunk with other Cisco switches. form a trunk if connected to another s..

VLANs(Part 3) ROASMethods of configuring native VLAN on router:- Use command encapsulation dot1q vlan-id native on the router subinterface- Configure IP address for the native VLAN on the router's physical interface (encapsulation... cmd not nessary)-> router was usded as the PC's gateway Layer3(Multilayer) switches: -> capable of both switching and routing-> Can assign IP addresses to its inter..