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Update 3-network-layer.md

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Computer-Network/3-network-layer.md
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@@ -610,7 +610,7 @@ $IP$组播地址能让源设备能将分组发送给一组设备，属于多播
### 硬件组播
同单播地址一样，组播$IP$地址也需要对应的组播$MAC$地址在本地网络中实际传输帧。组播$MAC$地址以十六进制值$01-00-5E$开头，余下的六个十六进制位根据$IP$组播组地址的最后$23$位转换而成，第$9$位为$0$。
同单播地址一样，组播$IP$地址也需要对应的组播$MAC$地址在本地网络中实际传输帧。组播$MAC$地址以十六进制值$01-00-5E$开头，即范围为$01-00-5E-00-00-00\sim01-00-53-7F-FF-FF$，余下的六个十六进制位根据$IP$组播组地址的最后$23$位转换而成，第$9$位为$0$。
![硬件组播][hardwaremulticast]