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  Can I pass CCNA without experience? I think that acquiring a CCNA accreditation is the initial step to prepare for an IT innovation career. To get the  CCNA certification , you need to clear an examination based on software application advancement skills, the latest network innovation, and task functions, covering IT careers’ broad fundamentals. CCNA offers you the basis for advancement in any direction. You may want to enter an innovation p r ofession. Otherwise, you may want to climb up. Networks, software, and facilities will be significantly interconnected. To sign up with a technology career in this quickly changing environment, you require to understand the current network innovation and automation, security, programmability, and working with supervisors, which needs your knowledge. CCNA accreditation will take you where you wish to go. The CCNA examination will cover a large variety of subjects, including network access, network fundamentals, security essentials, IP s...

Today we will consolidate the concept and application of the 802.1X protocol. In traditional corporate networks, it is generally believed that the corporate intranet is safe, and threats mainly come from outsiders. But in fact, the internal loopholes in the network damage the network more seriously. In addition, internal employees lack security awareness and malicious software such as various plug-ins, spyware, and Trojan horse programs will unknowingly be downloaded to the computer and spread on the corporate intranet, creating serious security risks. With the continuous escalation of security challenges, traditional security measures alone are no longer enough. You should consider starting with the security control of the terminal connected to the network, and the security status of the terminal and the network. 802.1x is mainly based on Client/Server access control and authentication protocol. It is mainly used to restrict unauthorized users from accessing the LAN/WLAN network throu...

In the VRRP standard protocol mode, only the Master router can forward packets, and the Backup router is in the listening state and cannot forward packets. Although the creation of multiple backup groups can achieve load sharing between multiple routers, the hosts in the LAN need to set up different gateways, which increases the complexity of the configuration. VRRP load balancing mode adds a load balancing function on the basis of the virtual gateway redundancy backup function provided by VRRP. Its realization principle is: Corresponding to a virtual IP address and multiple virtual MAC addresses, each router in the VRRP backup group corresponds to a virtual MAC address, so that each router can forward traffic.   In VRRP load balancing mode, you only need to create a backup group to achieve load sharing among multiple routers in the backup group, avoiding the problem of backup devices in the VRRP backup group being always idle and low network resource utilization. . The load balanc...

1. Regarding the IP Spoofing attack, if the source IP of the packet is constructed by itself, how should this packet be sent out of the gateway? Because the source IP may not be in the gateway subnet. The main network foundation is not very solid. The routing of IP packets on the network only uses the destination IP to query the routing table, and then decide which interface direction to continue to drive. Many routers do not look at the source IP at all, and attackers who forge the source IP will not expect the returned message to return the same way, which is impossible. It is impossible to think about it. As this type of attack has become more widespread, routers from some manufacturers have added a security feature. Before doing routing and forwarding, first check whether the source IP is legal. This is usually the easiest to check on the Internet ingress router. After all, the user's IP is assigned by himself, and it is clear that he is not legal. This security feature is...

First, let ’s make a statement. The default route and default route (Default Route) of all devices on the earth are “0.0.0.0”. The device here refers to any host, virtual host, router, switch, firewall. Therefore, there is no problem if the default route of the subject is "0.0.0.0". Here may be surprised that the subject is "Why is the default gateway empty"? The main problem is to confuse the default route with the default gateway, many people will make such a mistake! 200-301 ccna study guide pdf . The IP address dynamically obtained on the LAN host is generally like this: o IP = 10.117.124.149 o Mask = 255.255.255.0 o Default Gateway = 10.117.124.1 The host generally generates three unicast routes (except multicast and broadcast routes): o 10.117.124.149 255.255.255.255 Ethernet0 o 10.117.124.0 255.255.255.0 Ethernet0 o 0.0.0.0 0.0.0.0 Ethernet0 10.117.124.1 (next-hop) Default Gateway The last route is the default route, and t...

Human creativity is as powerful as destructive power." Network interoperability has also spawned complicated routing protocols and various Internet services. As well as the huge field of "network security." That's why all of today's network traffic that 80 % of the resources are wasted and only 20% is used for efficient data transmission. The anti-ring mechanism is generated under such a large background. Loops appear at all levels of the Internet and the causes and solutions of different loops are different. Usually the network loop is divided into a second layer loop and the three-layer loop. The formation of all loops is caused by the confusion of the destination path. The second layer loop is mainly a vicious circle of the switch broadcast stream. The three-layer loop is much more complicated and usually caused by various network failures. It is also focus on this paper. This article divides the three-layer loop into three : Single link l...