boson ccna

CCNA Study Notes (ii)--Initial knowledge of Cisco devicesIn the previous chapter we recognized the fundamentals of networking, and now we are formally exposed to Cisco devices.1, first we first understand the main components of a Cisco device:ROM (read-only memory): mainly save the post software, save the router boot boot program.RAM (random memory): loss of data, can store configuration files. >>> equivalent to PC memoryNVRAM (non-volatile memory): p

Routing protocols are used for router selection paths and for managing routing tables, which support routable protocols by sharing routing information between routers. Routing information is passed between neighboring routers to ensure that all

Enter "? The Show all HelpEnter the command? The show full command wordEnter the command? "Show command-available parameter informationPress "TABLE" to complete the command all wordsPress "up or down" to show used commandsPress "CTRL + Z" to leave

CDP protocol: Cisco Discovery ProtocolShow CDPShow CPD Neighbors: see which Cisco devices are connected to the current deviceCDP timer: Modify send interval timeCDP Holdtime: Modify retention timeCDP advertise-2: Modify version numberDebug CDP

Network devices (routers, switches, firewalls, and so on) require an operating system as well as computers. Network devices use a dedicated operating system, collectively known as iOS (Internetwork Operating system, network operating system).(1)

Seven-layer protocol and related instructionsPhysical layer Device: hub, Repeater, encoder-decoder, transmission media connectorHubs connect devices that share the same bandwidth in the same conflict domain, the same broadcast domain.Data Link Layer:

VswitchThe following figure shows the instance topology configuration: Basic vswitch Configuration Switch> enable  Switch# config ter   Switch(config)# hostname Switch  Switch(config)# interface vlan 1   Switch(config-if)# ip address 192.16

Clock Configuration 650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131227/0454301F6-0.png "title =" 1.png"/> 1. Configure vroa A (assuming vroa A is the DCE end of the serial line) Router> en Router # conf t Router (config) #

Dynamic Route RIP RIP broadcasts UDP packets to exchange route information and sends route information updates every 30 seconds. The maximum number of hops supported by RIP is 15. The experiment has been verified, but the topology is

[Lab environment] Cisco Packet Tracer 5.3.2 [PURPOSE] Do not describe the basic commands of Cisco IOS too much. Focus on learning Common Cisco IOS skills to improve the efficiency of subsequent experiments. [Experiment topology] Lab procedure] 1.

[Lab environment] Cisco Packet Tracer 5.3.2 [PURPOSE] Exercise configuring vswitch remote telnet Management [Experiment topology] Lab procedure] 1. Connect the device by topology. The router only configures the interface IP address, without

[Lab environment] GNS3 (Because Packet Tracer does not support DHCP-related commands, the GNS3 Simulator Based on the cisco ios image file can also be used on a real machine) [PURPOSE] Exercise configuring the DHCP service on a Cisco router to

[Lab environment] Cisco Packet Tracer 5.3.2 [PURPOSE] I will not describe the basic commands of Cisco IOS too much. I will focus on some common Cisco IOS skills to improve the efficiency of subsequent experiments. [Experiment topology] Lab

[Lab environment] Cisco Packet Tracer 5.3.2 [PURPOSE] Exercise the use of the ip default-network command to declare the default route in the network routing protocol. [Experiment topology] [Lab description] Vrogw GW and ISP refer to the default

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

of the Switch MAC Address learning Situation:1. Receive the data frame from an interface, look up the MAC Address table of the switch according to the original MAC address of the data frame, if not found, will add the original MAC address of the