? 發問時間: 社會與文化語言 · 1 0 年前

各位CCNA英文天才!! 20點

Here is an easy way to memorize the order of the layers:

All People Seem To Need Data Processing. The first letter of each word corresponds to the first letter of one of the layers. It is a little corny, but it works.

The table above mentions the term "MAC Address". A MAC address is a 48 bit address for uniquely identifying devices on the network. Something likes 00-00-12-33-FA-BC, we call this way of presenting the address a 12 hexadecimal digits format. The first 6 digits specify the manufacture, while the remainders are for the host itself. The ARP Protocol is used to determine the IP to MAC mapping. And of course, MAC addresses cannot be duplicated in the network or problems will occur. For more information about ARP and related protocols, read Guide To ARP, IARP, RARP, and Proxy ARP.

Data encapsulation takes place in the OSI model. It is the process in which the information in a protocol is wrapped in the data section of another protocol. The process can be broken down into the following steps:

User information -> data -> segments -> packets/datagrams -> frames -> bits.

When discussing the OSI model it is important to keep in mind the differences between "Connection-oriented" and "Connectionless" communications. A connection oriented communication has the following characteristics:

• A session is guaranteed.

• Acknowledgements are issued and received at the transport layer, meaning if the sender does not receive an acknowledgement before the timer expires, the packet is retransmitted.

• Phrases in a connection-oriented service involves Call Setup, Data transfer and Call termination.

• All traffic must travel along the same static path.

• A failure along the static communication path can fail the connection.

• A guaranteed rate of throughput occupies resources without the flexibility of dynamic allocation.

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  • 匿名使用者
    1 0 年前
    最佳解答

    這是英文翻譯嗎?

    若是,過兩天有空再翻譯解釋。

    2007-03-15 22:23:34 補充:

    這裡有記憶OSI 參考模組階層的順序方法。All People Seem To Need Data Processing(所有的人似乎需要資料處理),(因為有人記不起來OSI 7層名稱),因此以這句子每個字的第一字母代表(OSI model 7層由上而下)各階層英文名稱的第一英文字母(Application /Presentation /Session /Transport /Network /Data Link /Physical)。這方法有點陳腔濫調但他是有效的。

    這表有提到專用術語MAC address (媒體存取控制層位址即網路卡位址)。MAC address 是由48bit 所組成的位址且在網路是唯一的辨識號碼,例如00-00-12-33-FA-BC,由12個16進制的數字組成,前面6個數字辨別製造商其餘為自己網路卡編號。ARP (位址解析協定)被用於IP位址與MAC 位址的對應。MAC address 在網路上是唯一的不能被重複否則問題會發生。對於ARP更多的訊息及其相關的協定,請參考ARP, IARP, RARP, and Proxy ARP. 手冊。

    在OSI model的資料封裝,其過程由上而下將協定資訊與資料包裹起來

    這過程由上而下細分為下列步驟:

    使用者資訊、資料、分段、(封包/資料包)、訊框、位元。

    當討論到OSI model時要記住連結導向模式與非連結導向傳輸模式的不同,連結導向傳輸模式的特性是:

    一個點與點的連結是被保證的

    1.回應(ACK)的發送接收是在傳輸層產生,即發送端在過時之前沒收到ACK,這個封包會被重傳。

    2.連結導向傳輸模式服務包含連結建立、資料傳送和連結結束

    3.所有的資料流量必須沿著相同固定路徑走,

    4.沿著相同路徑的某個點連結失敗會導致整個點與點之間的連結失敗

    5. 輸出速率的保證是佔用資源的(頻寬),是不用動態分配的

    P.S.

    1.以前老外教我記,由下而上

    Please Do Not Throw Sausage Pizza Away 請不要亂丟義大利香腸Pizza

    2. CISCO network layer 的NPDU 稱為packet,正規稱datagram,而網路的一般封包叫packet,真會讓人產生混淆。

    3.翻譯有用網路觀點修飾過

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