During the installationvCenterwhen，In earlier versions it is generally to tie the domain controller? To complete，That has joined a domain and non-domain controller computer up to install vCenter，of course，Deployed to the ESXi hostapplianceThis is not within the scope of。
In vSphere 5.1 and later versions of them，VMware introduced a new service，This service is now also seem to most people criticized，That issign in（Single Sigh Onservice，That SSO)，Use this[……]
In the build a good vCenter Web Client，And registered vCenter Server after that，Open the appropriate Administration page with a browser，It was found in any case not log on，prompt"Invalid credentials provided”。
Finally log in on the still blank，Apparently without permission of the account，View full name of the account，That actually is the host vCenter installation of a local administrator account (forgive my brain capacity is small bar，I put all the administrator administrator accounts are set up with a password ......)[……]
Install Windows Server in VMware virtual machines 2008 R2 does not recognize the card，Drive can not be found，Many people say that because the default VMware NIC Model AMD PCNet AM79C970A，Not compatible with lead。Then modify the virtual machine configuration file，Manually modify the network card model
I used anothersimplerThe way to solve this problem before you install Make sure that you have installed VMware tools Oh!
================
exist[……]
Recently understand what virtualization，So, if you build a environment，During the installationvsphere clientWhen the connection to the server，Because other structures on hand before the rest of the environmentwin2003Virtual Machine，To save time I did not go to the new 2008 virtual machine，Result in the installation may prompt unsuccessful connection。
Results After installation is really successful!
Later found official explanation，Is such that：
vSphere 5.5 usesthe Open SSL library, which, for[……]
One problem encountered in a recent lecture over to them is an error at compile time asp.net "Make sure that the code defined in the class file and" inherits "attribute matches，And which extends the base class(Such as Page or UserControl)is correct。”
Was so amazing even encountered an error，That is the whole sample pages Copy the code can be executed，Copy the individually control error，error，Nature is more than a mistake。
From the Internet for answers，Probably there are two cases，I am fromHere[……]
We learnpointerWhen there may be a lot of things so that we confuse so I use a few small experimental program to give you answers to your questions：
First, from the definition, the variable is a pointer to the address stored in the variable。
Unary operator * is the indirection or dereference operator
Unary operator&Take for an object address，It can only be applied to objects in memory
That * (indirection get is a specific value stored in memory)
For pointers experiment
[crayon-69d56499a[……]
The first run on a Windows systemAll in One的GNS3when，Have a variety of configurations setup wizard，In the testdynamipsWhen prone to "Analyzing dynamips version fails"Prompt，A lot of people stuck in here at a loss。- I have encountered this problem。
Out of the Internet，Find information related to a good few，It was agreed that as long as the installedwinpcapEverything will be fine，ActuallyIt is notSuch，Unfortunately for installing the latest version ofwinpcapAfter the things no one filed。Now，I Laijiangjiang[……]
NBMAEarly in the CCNA to have contact，Only the name has no concept of，This may be said to be the fault of the translation，After all, the back of his translation did not add parentheses correspond to write about the English name ...... ah，At least not write the full name。so，If I do change itNon-Broadcast Multiple AccessWhen you know，Yes，NBMA is a non-broadcast multiple accessAbbreviation。
Stands fornon-broadcastmultipleaccess，MBA is the corresponding，Naturally, it is broadcastmultipleaccess，which iswide[……]
In the updated10.9formal editionafter that，FindSystem PreferencesPanelSecurity & PrivacyOptions somehow not open，Prompted：
Failed to load preferences pane "security and privacy"
Open your "other"Folder"Font Book"application，as the picture shows
Then find all the words "shut down"Font turn them to open!
You do not even have to restart your computer，"Security and privacy" Now you can use!
Other，A friend asked,[……]
Recently deal with some copy，Tragedy foundpagesthere has never beenChinese fontThis strange measure ...... no choice but to find a Chinese font andPoundsofComparedform，This looks a lot better ...... ah，For everyone to share it
[……]
existRSTP (Rapid Spanning Tree Protocol)Learning which，We will know RSTP different fromPVST (Per Vlan Spanning Tree)One of the places，It isPort Roles difference。As different port states believe everyone is familiar with，But the problem of port role，Many books and tutorial included in the classroom are a passing，In retrospect，Students can not help knowing a lot of questions，Let's take a look at this，Among the Rapid Spanning Tree Protocol，Exactly what role the port and the two often talked aboutAlternate ports and backup portsWhat is emerging。
BGP recently doing exercises，Do the following topology when encountered some problems，This topology is
I configured the network segment：
among them
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
R1 R1(config-if)#do sh ip int br Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset administratively down down Serial1/0 192.168.12.1 YES manual up up Serial1/1 192.168.13.1 YES manual up up Loopback1 1.1.1.1 YES manual up up |
|
1 2 3 4 5 6 7 8 9 |
R2 Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset administratively down down Serial1/0 192.168.12.2 YES manual up up Serial1/1 192.168.24.2 YES manual up up |
|
1 2 3 4 5 6 7 8 9 |
R3 Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset administratively down down Serial1/0 192.168.13.3 YES manual up up Serial1/1 192.168.35.3 YES manual up up |
|
1 2 3 4 5 6 7 8 9 |
R4 Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset administratively down down Serial1/0 192.168.24.4 YES manual up up Serial1/1 192.168.45.4 YES manual up up |
[cr[……]
In the EIGRP routing protocol，It does not seem to be able to issue commands directly to the default route，例如default-information originate
That should be how to do it? Here are two common methods：
one、Write a static default route，Then use the command to redistribute default route into EIGRP filling inside，Displaying such route entry for "D * EX" default administrative distance of 170；
two、Write a static default route，Then[……]
In the configuration in OSPF，There are portions of the content certification，OSPF authentication is divided into two，They are
- Based authentication area
- Based authentication link (port)
The same time，Authentication mode can also be divided into two，One is plain text authentication，Another is the MD5 encrypted authentication。
Here we do not discuss OSPF encryption method，It is simply illustrative ofRegional links and similarities and differences between these two types of authentication。
We agreed to a topology map，Probably like this
R1(s0 / 0)—–(s0 / 0)R2(s0 / 1)—-[……]
OC standard fiber cable is commonly used in today's networks set of standards，Readily not hurt to look at memory。
OC-1 — 51.8 4Mbit/sOC-3 — 155.52 Mbit/sOC-12 — 622.08 Mbit/s[……]
Yum(Full name Yellow dog Updater, Modified) Is anFedoraandRedHatas well asSUSE、CentOSThe front-end package manager Shell。based onRPMPackage Management，Can be automatically downloaded from the specified serverRPMAnd the installation package[……]
How do network also has a year，Speaking today, a fewAgreement with "arp" in accordance withSome confused old，So I come here to be a simple distinction。
This is not difficult to understand，arp protocol used in the computer artTao own MAC address and IP addressin the case of，It used to get the peer IP address corresponding to theMAC address。of course，MAC table of a switch is acquired from here，This is why you generally installed network，PING test of timeThe first package always MISS[……]
Some time ago I wroteA simple example Cisco routers DHCP and DHCP relay configuration，Article uses a command to achieve theDHCP forwarding，But this function is exactly how to achieve it? Now let's learn more about this command。
When the terminal equipment andDHCP serverWhen not on the same broadcast domain，Intermediate devices need to specify an address to be broadcast packet forwarded out，That needs to be sethelper_addressTo achieve relay。
In fact，In the enterprise generally only need one or two DHCP servers to provide sufficient redundancy，complete[……]
These days began playing with a BlackBerry，Engineering mode，Java development environment is installed on the computer，But always after the installation prompts
'javac’ Not an internal or external command balabalabala ... ...
Google ~ solution：
- Right-computer--> Properties-> The left side of the "advanced system settings"-> The "Advanced" tab –> Under the "environment variables"
- System variables，Creates a new variable named JAVA_HOME，Variable values[……]
