欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入 思科路由器交换机中的access-list(访问列表)最基本的有两种,分别是标准访问列表和扩展---- access-list 1 permit host 192.46.27.8 ---- access-list 1 permit host 192.46.27.12 ---- 注意,因为
欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入
思科路由器交换机中的access-list(访问列表)最基本的有两种,分别是标准访问列表和扩展---- access-list 1 permit host 192.46.27.8
---- access-list 1 permit host 192.46.27.12
---- 注意,因为所有的访问列表会自动在最后包括该语句.
---- 顺便讨论一下标准型IP访问列表的参数“log”,它起日志的作用.一旦访问列表
作用于某个接口,那么包括关键字“log”的语句将记录那些满足访问列表放在所有其它VLAN上直接.
3) 如果在内网口上放置: 在入上设置Reflect
如果在外网口上放置: 在出口上放置Reflect
LAN WAN
-
inbound outbound
4)reflect不对本地路由器上的数据包跟踪,所以对待进入的数据包时注意,要允许一些
数据流进入
从IOS12.0开始,CISCO路由器新增加了一种基于时间的访问列表.通过它,可以根据一天ed auto
!
interface Serial2/0
ip address 12.1.1.1 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
serial restart_delay 0
frame-relay map ip 12.1.1.2 102 broadcast
no frame-relay inverse-arp
!
interface Serial2/1
ip address 13.1.1.1 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
serial restart_delay 0
frame-relay map ip 13.1.1.3 113 broadcast
!
interface Serial2/2
no ip address
shutdown
serial restart_delay 0
!
interface Serial2/3
no ip address
shutdown
serial restart_delay 0
!
router ospf 10
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
!
ip http server
no ip http secure-server
ip classless
!
!
!
!
!
call rsvp-sync
!
!
mgcp profile default
!
!
!
dial-peer cor custom
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
no login
!
!
end
!
!
!
[1] [2]

The main difference between MySQL and SQLite is the design concept and usage scenarios: 1. MySQL is suitable for large applications and enterprise-level solutions, supporting high performance and high concurrency; 2. SQLite is suitable for mobile applications and desktop software, lightweight and easy to embed.

Indexes in MySQL are an ordered structure of one or more columns in a database table, used to speed up data retrieval. 1) Indexes improve query speed by reducing the amount of scanned data. 2) B-Tree index uses a balanced tree structure, which is suitable for range query and sorting. 3) Use CREATEINDEX statements to create indexes, such as CREATEINDEXidx_customer_idONorders(customer_id). 4) Composite indexes can optimize multi-column queries, such as CREATEINDEXidx_customer_orderONorders(customer_id,order_date). 5) Use EXPLAIN to analyze query plans and avoid

Using transactions in MySQL ensures data consistency. 1) Start the transaction through STARTTRANSACTION, and then execute SQL operations and submit it with COMMIT or ROLLBACK. 2) Use SAVEPOINT to set a save point to allow partial rollback. 3) Performance optimization suggestions include shortening transaction time, avoiding large-scale queries and using isolation levels reasonably.

Scenarios where PostgreSQL is chosen instead of MySQL include: 1) complex queries and advanced SQL functions, 2) strict data integrity and ACID compliance, 3) advanced spatial functions are required, and 4) high performance is required when processing large data sets. PostgreSQL performs well in these aspects and is suitable for projects that require complex data processing and high data integrity.

The security of MySQL database can be achieved through the following measures: 1. User permission management: Strictly control access rights through CREATEUSER and GRANT commands. 2. Encrypted transmission: Configure SSL/TLS to ensure data transmission security. 3. Database backup and recovery: Use mysqldump or mysqlpump to regularly backup data. 4. Advanced security policy: Use a firewall to restrict access and enable audit logging operations. 5. Performance optimization and best practices: Take into account both safety and performance through indexing and query optimization and regular maintenance.

How to effectively monitor MySQL performance? Use tools such as mysqladmin, SHOWGLOBALSTATUS, PerconaMonitoring and Management (PMM), and MySQL EnterpriseMonitor. 1. Use mysqladmin to view the number of connections. 2. Use SHOWGLOBALSTATUS to view the query number. 3.PMM provides detailed performance data and graphical interface. 4.MySQLEnterpriseMonitor provides rich monitoring functions and alarm mechanisms.

The difference between MySQL and SQLServer is: 1) MySQL is open source and suitable for web and embedded systems, 2) SQLServer is a commercial product of Microsoft and is suitable for enterprise-level applications. There are significant differences between the two in storage engine, performance optimization and application scenarios. When choosing, you need to consider project size and future scalability.

In enterprise-level application scenarios that require high availability, advanced security and good integration, SQLServer should be chosen instead of MySQL. 1) SQLServer provides enterprise-level features such as high availability and advanced security. 2) It is closely integrated with Microsoft ecosystems such as VisualStudio and PowerBI. 3) SQLServer performs excellent in performance optimization and supports memory-optimized tables and column storage indexes.


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