ccna nuggets

During the preparation of the CCNA, the route has been in a state of confusion. Therefore, keep a record of your daily study notes so that you can view them later.There are two configurations for static routes, one is a static route with the next-hop address, and the other is a static route with a send-out interface.For static routes, the usage is as follows:One, the network contains only a few routersSecond, the network only through a single ISP acce

=" Wkiol1v5lvsbigthaaigelwi5vm703.jpg "/>650) this.width=650; "title=" 2015-6-11 21-29-58.png "style=" Float:none; "src=" http://s3.51cto.com/wyfs02/M01/6E/5A/ Wkiom1v5k63hler0aaro7bjdduw589.jpg "alt=" Wkiom1v5k63hler0aaro7bjdduw589.jpg "/>650) this.width=650; "title=" 2015-6-11 21-37-54.png "style=" Float:none; "src=" http://s3.51cto.com/wyfs02/M02/6E/56/ Wkiol1v5lvstiov0aaqj54spsoc303.jpg "alt=" Wkiol1v5lvstiov0aaqj54spsoc303.jpg "/>650) this.width=650; "title=" 2015-6-11 21-42-38.png "style="

Today continue to share some commands for the router's basic configuration. First look at our future configuration routing, partition VLAN used topology diagram, in the future we will use this topology map to complete the later experimental 650) this.width=650; "title=" capture.jpg "src=" http://s3.51cto.com/ Wyfs02/m01/6c/7d/wkiom1vkidjg8lilaadnhwbhx8e751.jpg "alt=" Wkiom1vkidjg8lilaadnhwbhx8e751.jpg "/>The commands we want to share today are:Line console 0 enters the debug port,Logging SYN Clo

subnet; the last IP address that can be assigned to the PC; The subnet's broadcast address.Two. The number of IP addresses required for each subnet is known1. Calculate the number of bits required for the host part (2 of the n is slightly larger than the number of IP, n is the host bit)2.32-host bits = = number of network bits3. Calculate subnet mask for subnets4. Reach the subnet segment (network address)5. The first IP address that can be assigned to a PC under each subnet; the last IP addres

. Trunk between switches2. All switches establish the same VLAN, (VTP)3. Each switch strokes the interface into the appropriate VLAN4. Configuring Layer 3 Information (IP)VtpVTP is used to unify the creation and deletion of VLAN information.VTP3 mode:Server: Can add, remove VLANs, learn VLAN information, transmit VLAN information to other peopleClient: Can not add, delete VLAN, can learn VLAN information from server, pass the learning information to othersTransparent: You can only add and delete

control lists can be used to overcome this shortcoming.(7) The invocation of the list. An access control list can be used on many different interfaces of the same router, and there is no need to define an access control list with different table numbers and identical content for each interface that needs it. If you do not provide any access control lists to the interface, or provide an undefined access control list, it will pass all traffic by default. If you want the access control list to be

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9

ICMP Echos to 192.168.20.1, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 24/48/84 MS From the above, we can see that through the deployment of layer-3 switching technology, the host between VLANs can communicate with each other. This experiment is complete. [PL1]Disable layer-3 routing to simulate hosts. [PL2]Define the default gateway. [PL3]Enable the layer-3 routing function. By default, the layer-3 Switch disables the routing function. To enable int

This section lets us learn the next Frame RelayFrame Relay in CCNA's exams and daily work are seldom useful, but we still want to know, it is after all a CCNA in the focus.Frame Relay (Frames relay)Also referred to as FRFrame Relay is an important WAN technology, its main function is to connect two or more long-distance LAN. Frame Relay is mainly a packet switching technology, usually we just want to know how to connect LAN through Frame Relay and lon

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

"In the Internet traffic, only 4% is the search traffic, the rest is browsing traffic, how can the latter be further realizable?" "May 14, in Sanya, held in the Baidu Alliance summit, face from the country's hundreds of alliance partner

Recently, the famous mobile technology consulting company Research2guidance released the latest version of the "Mobile Medical application developer Economics" report. In the past 2.5 years, mobile medical applications (hereinafter referred to as

  The figure shows the IOT architecture.   Nowadays, the Internet of Things (IOT) is a popular term. people refer to it as the "artificial skin" on the Earth's surface ". Everyone does not have the same understanding of Iot. In fact, it is

Cai Wen Sheng Famous, naturally have heard. Computer newspaper on an article about him and Lenovo FM365 between the enmity and enmity, once gave me a deep impression, the first time to know that there are people who play the domain name. After a

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: