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[……]
