cisco 3745

Premise: With the development of the network, network security has become an important topic at present. More and more companies will choose to use the firewall as the company's egress device. Compared with the router, the firewall not only has the forwarding routing function, it can also filter internal and external traffic to further enhance the security of the company's network. Tutorial topology: 650) This. width = 650; "Title =" 1.png" src = "http://s3.51cto.com/wyfs02/M00/4D/B5/wKioL1RYKB

Tags: cal enhancement packet share image share access Cisco virtual SRCVLAN, the virtual LAN (Virtul local area network), the VLAN divides the physical connected LAN logic into different virtual networks, its existence can reduce the broadcast domain, enhance the network security and convenient and flexible networking, adding PCs and switchesBy configuring VLANs, you can implement PC1 and PC2 that are connected to the same switch and cannot communicat

ObjectiveLearning Network knowledge of the students have heard or used the network device Simulator, network equipment simulator known to have Huawei's ENSP, Third HCl and Cisco PACKET TRACER, Cisco's simulator with a simple operation interface, Easy to install and use and a variety of easy to work can win a lot of network engineers and students praise. Because I am short-sighted, I will be the most basic level of operation, the shortcomings are also

Tags: HSRP working principle STP effect ACL access control List loop storm Cisco private protocolDay 031. What is HSRP? How does it work?HSRP: Hot Standby Routing protocolHSRP is a Cisco private protocol that ensures that user communication can be quickly and transparently restored when a network edge device or access link fails.This provides redundant rows for the IP network. By using the same virtual IP a

Cisco CCNA Chapter 7 answers for the third semester, Cisco ccna for the third semester 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.

Cisco CCNA Chapter 6 answers for the third semester, Cisco ccna for the third semester 1. 2. 3. 4. During the implementation of inter-VLAN routing, what are the important considerations when configuring the sub-interface of the router? The physical interface must have an IP address. The sub-int

, adding switches and end devices1, double-click switch into switch command line (CLI) mode, switch configuration mode by command2 in most cases for security reasons, you need to configure the switch privileged mode passwordValidation test3 Configuring the telnet login switchTo achieve remote login, first need to configure the login user and device management addressVerify the configuration by matching the IP address of the PC with the switch management address into the same network segment and

Technical standards for VLANs IEEE 802.1Q was formally promulgated by IEEE Commissioners in June 1999, and the earliest Vlna technology was proposed by Cisco (Cisco) companies in 1996. With the development of the past few years, VLAN technology has been widely used in large and small enterprise networks, becoming the most popular Ethernet LAN technology at present. This article is going to introduce one of

Tags: size src zone sha port text topology Cisc-oTwo networks in different regions if you want to communicate, you need to configure routing on the router to implement the packets across the networkRouters can connect to multiple networks, but the router itself does not know about other networks, and we need to manually configure static routes to let routers know about other network information or to configure dynamic routing to let routers learn about other networks themselves.This learning con

Tags: color-o switch test one-arm routing access via interface implementation representationTo achieve inter-VLAN communication, in addition to configuring the SVI interface on the switch, you can also implement VLAN data forwarding by configuring sub-interfaces under the physical interface of the router.Configuration ideas:1 The access switch configures the corresponding VLAN and sets the access PC port to access mode2 Setting the physical interface of the router to which the switch is connecte

Nat[network address translation] In the absence of IP address in the case of a great use, it can not be normal Sisu network of the intranet address into a legitimate external network address on the public network to send and receive data. At the same time address translation function can also be very good to hide and protect the host network.Nat has static NAT (internal address and external address one-to-one) and dynamic NAT (internal address pool and external address Pool A-do)This time we'll

Network address port Conversion NAPT is a very familiar way of transformation. NAPT is commonly used in access devices, which can hide small and medium-sized networks behind a legitimate IP address.Unlike dynamic address NAT, NAPT maps An internal connection to a separate IP address in the external network, adding a TCP port number selected by the NAT device to the address.This time, let's get to know napt.Configuration ideas1 Configure the router's interface IP address, note the network segment

RIP protocols can be configured in a more convenient way, but the limitations of RIP itself indicate that it is not suitable for medium to large networks. In contrast, OSPF is more complex to configure than RIP, but its functionality and performance are better than RIP.Configuration ideas1 Configure the physical interface address of the router Xia Lian switch and the physical interface address of the router to the other router and open the port2 Configure the address of the switch Xia Lian PC an

Through the previous experiment we learned that by configuring VLANs, the terminals under different VLANs could not communicate with each other, but if you wanted to communicate between different VLANs, you would need to configure inter-VLAN routingLayer three switches have the capability of the network layer and can be forwarded via the routing functionNetwork environment1 set the IP address and gateway of the terminal (192.168.1.1 and 192.168.2.1, respectively).2 VLAN is configured under Layer

Overview This product announcement focuses on Cisco®Catalyst®Cisco IOS on 6500 series switches®See Figure 1 ). The Cisco Catalyst 6500 series, modular with Cisco IOS software, improves operational efficiency and minimizes downtime through continuous evolution of software infrastructure. By running the modular

WIN8 Cisco VPN 442 Error solution/Error Code 442 Cisco VPN Clinet with Windows 8 when you start using win8, because of work needs to use Cisco VPN Client, however, in win8, the Cisco VPN Client reports a 442 Error and cannot be used. The following Error message is displayed: Error Code 442 while connect to VPN server b

"Introduction" Within a switched network, it is possible to segment and organize flexibly through VLANs. VLANs can group devices in a LAN. A group of devices in a VLAN communicates as if it were connected to the same line. VLANs are based on logical connections, not physical connections. Types of VLANsThere are many different types of VLANs used in modern networks. Some VLAN types are defined by traffic category. Some other VLAN types are defined by specific features.Data VLAN: used to deliver u

Automatic backup and fallback of Cisco iOS profiles requires the use of the Archive Archive configuration mode feature of iOS. In general, only the version number of iOS has the Archive configuration mode feature in 12.3 (4) Cisco iOS profile automatic backup All commands are as follows: router> Router>enable Router#configure Terminal Router (config) #archive Router (config-archive) #write-memory

Trunk Link Trunk: Same inter-VLAN communication on different switchesHow to play tag tag encapsulationPackage Type: IEEE 802.1q/cisco ISLIEEE 802.1q:4 Bytes, internal encapsulation, publicCisco isl:30 bytes External encapsulation, privateSwitch port configuration mode: Trunk/acces (OFF)/Dynamic desirable/dynamic AutoTwo auto NO mode of operation generally either trunk or accessEthernet Channel: Multiple physical ports to form a logical port for greate

This article describes how to configure the IOS Firewall on a Cisco router. What should we pay attention to when configuring the firewall? The following article provides detailed answers. Pre-configuration on R1, R2, and R3 R1 (config) # int e0/0R1 (config-if) # ip add 172.16.1.1 255.255.255.0R1 (config-if) # no shR1 (config) # ip route 0.0.0.0 0.0.0.0 172.16.1.2 configure Static RoutingR1 (config) # ^ ZR2 (config) # int e0/0R2 (config-if) # ip ad