ASN.1的数据类型分为简单类型和应用类型。计数器类型Counter：：=和计量器类型Cauge：：=属于什么类型？两者主要有什么不同？两种类型的最大值是多少？哪一种类型的值可以增加，但不能减少？哪一种类型的值既可以增加，也可以减少？
参考答案：
计数器类型Counter：：=和计量器类型Cauge：：=都属于应用类型。计数器可用于计算收到的分组数或字节数等，计量器可用于表示存储在缓冲队列中的分组数。两种类型的最大值是2的32次方减1。计数器类型Counter：：=可以增加，但不能减少，达到最大值回零。计量器类型Cauge：：=其值可以增加，也可以减少，大到最大值后不回零，锁定在2的32次方减1。
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