Ethtool is the command used to query and set the network card parameters.
Overview: Ethtool ethx //Query ETHX network basic settings ethtool–h //Display ethtool command help ethtool–i ethx //query Ethx the relevant information
Bit bit (binary Digits): holds a binary number, which is 0 or 1, the smallest storage unit. byte byte:8 binary [bit (binary Digits)] bit is a byte (B), the most commonly used unit. 1B (byte- bit ) = 8bit (Binary Digits bit) is generally represented by B,KB,MB,GB,TB,PB,EB,ZB,YB,BB, and the relationship between them is: 1KB (kilobyte KB) = 1024B,1MB (megabyte megabyte abbreviated as "Mega") =1024KB,1GB (Gigabyte gigabyte, also known as "gigabit") =1024m
, also known as "gigabit") =1024mb= 2^30 B;1TB (Terabyte, trillion bytes, MBytes) =1024gb= 2^40 b;1pb (petabyte, petabyte bytes, Pat bytes) =1024tb= 2^50 B; An array of any data type requires 20 bytes of memory space, plus 4 bytes per array dimension, plus the space occupied by the data itself. The amount of memory occupied by the data can be calculated by multiplying the number of data elements by the size
The Byte conversion function is used to convert kb to mb, gb, tg, eb, pb and other units. This function is very useful for file uploading. We will share with you a function below. The Byte conversion function is used to convert kb to mb, gb, tg, eb, pb and other units. This function is very useful for file uploading. We will share with you a function below.
Script ec (2); script
The Code is as follows:
// Byte ConversionFunction conversion ($ size ){$ Kb = 1024; // 1K
, and the maximum value is 255. such as an ASCII code is a byte. UTF-8 encoding: An English character equals one byte, and one Chinese (with traditional) equals three bytes. Unicode encoding: One English equals two bytes, and one Chinese (with traditional) equals two bytes. Symbol: English punctuation occupies one byte, Chinese punctuation is two bytes. Example: "." 1 bytes in size, Chinese period ". "Takes up 2 bytes in size.between different orders of magnitudeData storage is represented in 10
GE switches are worth learning a lot. Here we will introduce you to the future development direction of GE switches, which are serious experts. The reporter interviewed experts in the field of GE switches on hot topics, including technical experts from equipment suppliers and network construction experts from users. Each of them holds one word, and their points of view are roughly divided into two schools. In our answers to the following questions, we will separate the two comments with A and B.
The advent of the information age means that we have more and more requirements for the speed of the network, we have to transfer files through the network, but also through the network to hold video conferencing; We not only need to send and receive mail, but also quickly download a variety of video, audio files. And with the speed of the network from the original one trillion, 10 trillion, a few years ago, hundreds of trillion, developed to today's gigabit
MCE1 on the Cisco 7000 series and the E1, CE1 on the Cisco 2600/3600?
The MCE1 on the Cisco 7000 can be configured as E1, CE1, while the E1, CE1 on the Cisco 2600/3600 only supports its own functionality.
28. Does the CISCO 2600 series routers support inter-VLAN routing, and what are the requirements for iOS software?
In Cisco (2600 series routers, only Cisco2620 and Cisco2621 can support inter-VLAN routing (The Hundred-Gigabit eloquence supports
the following:
Only the Fast Ethernet hybrid network module can support these two wan interface cards.
The network modules supporting these two interface cards are as follows:
NM-1FE2W, NM-2FE2W, NM-1FE1R2W, NM-2W.
The Ethernet hybrid network module does not support the following features:
NM-1E2W, NM-2E2W, NM1E1R2W.
19. What is the maximum rate of synchronization supported by Cisco3600 series routers (4A/S, NM (8A/S network module and WIC (2A/s wan Interface Card?
These network modules and WAN
provides sufficient performance to support this application.
Small companies are typical representatives of this environment. They have basic network facilities or relatively simple IT needs. The software systems it runs may include text processing, workbooks, inventory management, billing management, and document storage systems. Another possible scenario is that users with relatively short lease periods cannot foresee switching to over Mbps Ethernet during their stay. In this case, cat5e is s
supports hot swapping of network modules, while Cisco3620/3640 does not support hot swapping of network modules.
* The Cisco3660 redundant power supply is built in, while the Cisco3620/3640 redundant power supply is external.
24. Why 3640 cannot identify NM-1FE2W?
Upgrade IOS to 12.0.7T
Vswitch Problems
About vswitches:
1. How is the stacking of Catalyst 35500XL/2950XL implemented?
A. dedicated stacked cables, 1 m long or 50 cm long (CAB-GS-1M or CAB-GS- 50CM) and dedicated
support inter-VLAN routing? What are the requirements for IOS software?In Cisco (2600 series routers, only Cisco2620 and Cisco2621 support inter-VLAN routing (MB ports support inter-VLAN Routing ). If Inter-VLAN routing is supported, IOS software must include the IP Plus feature set.6. What are the differences in hardware between the Cisco3660 router and the 3620/3640 router?The differences are as follows:* The basic configuration of the Cisco3660 router includes one or two 10/100 M Adaptive Fa
Gigabit stacked card GigaStack GBIC (WS-X3550-XL) (the card already contains CAB-GS- 50CM stacked cables) are required ).
You can use either the chrysanthemum Link Method (providing 1g bandwidth) or the point-to-point method (providing 2G bandwidth ).
C. Both methods can be used for backup.
D. The Chrysanthemum Link Method supports stacking of up to 9 switches, and the point-to-point method supports up to 8 switches.
32. Does the Catalyst 3550 XL ser
dedicated Gigabit stacked card gigastack GBIC (WS-X3550-XL) (the card already contains cab-gs- 50CM stacked cables) are required ).B. Two stack methods can be used: the chrysanthemum Link Method (providing 1g bandwidth) or the point-to-point method (providing 2G bandwidth ).C. Both methods can be used for backup.D. The Chrysanthemum Link Method supports stacking of up to 9 switches, and the point-to-point method supports up to 8 switches.2. is redund
Based on the continuous development and application of new technologies, such as cloud computing and IoT, network demand for bandwidth is increasing, especially in the cloud computing environment in the data center will be a large number of virtualization technology, thereby maximizing the utilization of server equipment, which requires a higher bandwidth cabling system to support the cloud Computing data Center network communication, 10G (Gigabit Eth
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