IELAB

Ccie exam fee A brief look at vxlan technology (4) VXLAN tunnel   "Tunnel" is a logical concept, it is not new, such as the familiar GRE. To put it bluntly, the original message is "transformed" and "packaged" so that it can be transmitted on a bearer network (such as an IP network). From the perspective of the host, it is as if there is a straight link between the start and end of the original message. Ccie exam fee.And this seemingly straight link is the "tunnel." As the name implies, the "VXLAN tunnel" is used to transmit packets that are encapsulated in VXLAN. It is a virtual channel established between two VTEPs. The payload message inside VXLAN specified in RFC7348 must be an Ethernet packet, which limits the scope of use of the VXLAN protocol. In order to allow VXLAN to support Overlay transmission of other protocol messages more widely, the RFC draft is exploring VXLAN Generic Protocol Encapsulation (GPE), which is a VXLAN ge...

Ccie exam fee A brief look at vxlan technology (3) VXLAN communication process: For two virtual terminals in the same VXLAN, the communication process can be summarized as follows: 1. The sender sends a data frame to the receiver, which contains the virtual MAC address of the sender and receiver. 2. The VTEP node connected to the sender receives the data frame. By looking up the VXLAN where the sender is located and the VTEP node to which the receiver is connected, After adding the VXLAN header, the external UDP header, and the external IP header, the packet is sent to the destination VTEP node.ccie exam fee 3. The packet is transmitted over the physical network to the destination VTEP node. 4. After receiving the packet, the destination VTEP node removes the external IP header and the external UDP header of the packet, checks the VNI of the packet, and the destination MAC address of the internal data frame.ccie exam. After confirming that the receiver is connected to the VTEP node, ...

ccie certification cost A brief look at vxlan technology (2) VXLAN is transmitted by encapsulating data frames communicated in a logical network in a physical network. Ccie certification cost .The process of encapsulation and decapsulation is performed by a VTEP node. After VXLAN adds the data frame in the logical network to the VXLAN header, it is encapsulated in the UDP packet in the physical network. • Outer MAC Header: Encapsulates the outer Ethernet header, 14 bytes, or 18 bytes if there is a VLAN TAG. The source MAC address is the MAC address of the VTEP to which the source VM belongs, and the destination MAC address is the MAC address of the next hop device on the path to the destination VTEP. The type field is 0x0800, indicating that the inner layer encapsulates an IP packet.Ccie certification cost . • Outer IP Header: Encapsulates the outer IP header, 20 bytes. The source IP address is the IP address of the VTEP to which the source VM belongs, and the destination IP...

VLAN means Virtual Local Area Network, which is the concept involved in the implementation of the switch, defined by the 802.1Q standard. Because the switch is a network device working at the link layer, the terminals connected to the same switch are in the same Layer 3 network and are also in the same broadcast domain. Ccie certification cost.When a switch accesses a large number of terminals, any one of the terminals sends a broadcast packet (for example, an ARP request), and the packet is transmitted throughout the network. For large-scale networking scenarios, the flood of broadcast packets will have a greater impact on network communications. VLAN technology provides a solution to this problem. A VLAN divides the same network into multiple logical virtual subnets. It also stipulates that when a broadcast packet is received, it broadcasts only in its VLAN to prevent broadcast packets from flooding. VLAN technology implements broadcast domain isolation at the link layer level VXLAN ...

Ccie lab dumps Introduction to SPAN and RSPAN for port mirroring(1) SPAN technology is mainly used to monitor the data flow on the switch, which is roughly divided into two types, Local Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN), the implementation method is slightly different. With SPAN technology, we can COPY or MIRROR the data stream of some ports on the switch that we want to be monitored.ccie lab dumps.Send to the traffic analyzer connected to the destination Port , such as CISCO IDS or PC with SNIFFER tool. The Source Port and destination Port can be on the same switch (local SPAN) or on different switches ( Remote SPAN). SPAN, known as Switched Port Analyzer, it is a port mirroring technology for switches. The main purpose is to provide network data flow to a certain network analyzer. Ccie lab dumps.SPAN does not affect the data exchange of the source port. It simply sends a copy of the packet sent or received by the source port to the destination Port . RSPAN (Remot...

      Cisco ccie exam Linux overview and history Simply put, the Linux operating system is a clone of the UNIX operating system, which was born on October 5, 1991 (the first time it was officially announced). It's the same as Microsoft's Windows, apple's MAC OS and android on mobile phones. Cisco ccie exam.Compared to ordinary people, Linux system may be relatively unfamiliar, and most of them are probably familiar with Windows system. Since the graphical interface of Windows is simpler and easier to use, Windows occupies more markets, and Linux systems are mainly command-line operations, which are more demanding for professionalism.Cisco ccie exam Linux systems are stable, secure, and have strong concurrency, so they are widely used in the server field. The professional servers are almost all Linux systems. Linux is open source, free, everyone can see the source code of Linux, you can use Linux for free. And the Linux kernel is short and lean, and some can only be a ...

cisco ccie exam 5G and WIFI6, still can't tell? (1) Ⅰ. the opening: On October 3, 2018, the Wi-Fi Alliance officially incorporated WiFi based on the 802.11ax standard into the regular army and became the sixth generation WiFi technology. The WiFi specification was renamed, the standard 802.11n was renamed to WiFi 4, the standard 802.11ac was renamed to WiFi 5, and the new standard 802.11ax was renamed to WiFi 6. (Of course, the previous generation of 802.11b/a/g can be chased as WiFi 1/2/3) Not only changed the naming convention of WiFi, but also in the network connection of WiFi devices. Also all use the new UI icon. The icon will display the level of the WiFi network you are currently connected to through the most intuitive numbers. Wi-Fi is well known to us. Wi-fi has evolved from 802.11b in 1999 and has gone through five generations. The Wi-Fi Alliance announced the simplification of the name of the new Wi-fi to Wi-fi6 when it introduced the new generation of 802.11ax stan...