ccna commands

1, backup configuration to TFTP2, from TFTP COPY to run3. Back up iOS4. Upgrade iOS5, if the upgrade fails the workaroundOne, backup restore configuration1, to ensure that the router and computer (TFTP server) network IP (direct connection, same

First, the function1.MAC Address Learning2. Confirm the forwarding and filtering of frames3. Prevent loopsSecond, the way of frame exchange1. Passthrough forwarding: The switch detects the destination address immediately after forwardingFast forward

In a strange environment, if you want to reach a certain location, there are three methods: the first method is to ask a wizard, as long as you want to clearly describe the destination, you don't have to worry about it along the way. The Wizard will

Above we have realized that RIP (routing Information Protocol) &EIGRP (Enhanced Gateway Routing protocol), we come to know the following routing protocol OSPF (Open Shortest Path precedence protocol) also called it as an interface-sensitive routing

Which layer in the OSI Reference Model was responsible for determining the availability of the receiving program and Checki Ng to see if enough resources exist for that communication?A. TransportB. NetworkC. PresentationD. SessionE. ApplicationTest

· Dynamic Routing : a route that can be self-adjusted based on network structure or traffic changes· category :1. Distance vector Routing Protocol (DV): RIP, IGRP Send routing entry via routing protocol2, Link State routing Protocol (LS): OSPF,

Auto is passive, desireable is activeAcive is active, passive is passive, different manufacturers recommend configuring onSW1 (config) #int range f0/1-2SW1 (config-if-range) #channel-group? Channel Group numberSW1 (Config-if-range) #channel-group 1%

First, the OSPF characteristics: 1.IETF Standard: Open room agreement, supported by different manufacturer's equipment 2. No loop by protocol: the implementation of SPF algorithm, will not produce loops 3. No class routing protocol: Support for

(1) interconnection between the VLAN: single-arm routing (2) Each PC can automatically obtain IP address: DHCP (3) Two switches require VLAN2 to go above, VLAN3 go below: STP load Balancing (4) SW2 can learn from SW1 VLAN related information:

1. Functions of the data link layer Implements data error-free transmission. It receives raw data from the physical layer to form frames and bit groups) and transmits data between network devices. The frames contain the physical addresses of the

CDPCommand Show cdp neighbors displays connected network devices Show cdp display CDP Global Information Show cdp entry * displays all information about all adjacent routers. Show cdp entry WORD (vro name) displays all information about the vro. Un

IP subnetting and variable length subnet masks (vlsm) Subnetting Basics Advantages of subnetting: 1. reduce network traffic 2. Improve Network Performance 3. simplified management 4. Easy to expand geographic scope How to creat subnets How do I

Refer to the exhibit, Host A pings interface s0/0 on Router 3, what's the TTL value for that ping?650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M01/8B/80/wKioL1hP7uixEixbAAH9oTpw4uM620.png "title=" QQ picture 20161213205137.png "alt=" Wkiol1

802 provisions802.1 bridging802.2 Logical Link Control802.3 Ethernet802.4 Token delivery Bus802.5 Token Ring802.6 Distributed queue Dual-entry bus access Service802.9 Integrated Services802.11 Wireless LAN802.14 Cable TV802.15 Person Wireless

First, the actual application of the network classificationBlock data streams: FTP, TFTP, inventory updateNo direct human interaction requiredBandwidth is important, but not a critical factorInteractive Data Flow: Inventory queries, database

1. Network Segment (segmentation)In order to cope with the increase of the network caused by slow user response and traffic congestion, the large network is divided into a number of small network behavior. You can use devices such as routers,

Routing Protocol Overview : Through a routing protocol, many routes to the same target network are learned, and metric is placed in the routing table. Metric, the same time, put in the routing table. Through a variety of routing

WAN ( Wide Area Network ) WanThe data link layer, the physical layer, running in the OSI model.The protocols of the data link layer are mainly:HDLC (High-level Data Link control)PPP (Point-to-point Protocol-to-dot protocol)Frame-relay (Frame

Transport Layer: two important agreements TCP and the UDPTcp: Connection-oriented protocol: to establish a connection (three handshake of TCP) before transmitting user data Error checking Packet serialization Reliability

After learning rip, we know some basic routing protocols for routing, and now let's get to know a private protocol for Cisco: EIGRPEIGRP Routing Protocol(also known as Enhanced Internal Gateway Protocol Enhanced Interior Gateway Protocol)It is a