Link layer servicesframing, link a

Link layer servicesframing, link access:encapsulate datagram into frame, adding header, trailerchannel access if shared medium“MAC”addresses used in frame headers to identify source, dest•different from IP address!reliable delivery between adjacent nodeswe learned how to do this already (chapter 3)!seldom used on low bit-error link (fiber, some twisted pair)wireless links: high error rates•Q:why both link-level and end-end reliability?

結果 (繁體中文) 1:

鏈路層的服務


成幀，鏈路接入：
encapsulate數據報的幀，附加標題，拖車
channel如果訪問共享介質
在幀頭用於識別源，DEST“MAC”地址
•從IP地址不同！
相鄰節點之間reliable交付
we學會了如何做到這一點已經（第3章）！
低誤碼鏈路上使用seldom（纖維，某些雙絞線）
wireless鏈接：高錯誤率
•問：為什麼兩個鏈路級和端到端的可靠性？

結果 (繁體中文) 2:

Spaniards meet etiquette general handshake, kiss and hug and other three ways, from the handshake, by the elderfirst reach out, superior first reach out, master first reach out for politeness, between men and women should be the woman first reach out, and men can not shake hands too tight, otherwise very disrespectful, acquaintances and family, mostly kiss or hug, The most common is hugging and kissing men and women in Spain

結果 (繁體中文) 3:

連結層服務

框架，連結訪問：
將數据包封裝到幀中，添加頭、尾
共亯介質時的通道接入
“MAC”地址在幀頭中用於標識源dest
•不同於IP地址！
◇相鄰節點之間的可靠傳輸
我們已經學會了怎麼做（第3章）！
很少用於低比特錯誤連結（光纖、一些雙絞線）
無線連結：高錯誤率
•問：為什麼連結級和終端可靠性都是如此？