From 8bdb6fbbc58f6e7989ef770d40a22d65607f985b Mon Sep 17 00:00:00 2001
From: Peng Hailin <unisko@gmail.com>
Date: Wed, 31 Aug 2016 10:47:11 +0800
Subject: [PATCH] update

---
 d05-IP-Addressing.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/d05-IP-Addressing.md b/d05-IP-Addressing.md
index fc0f7ea..6a626ee 100644
--- a/d05-IP-Addressing.md
+++ b/d05-IP-Addressing.md
@@ -523,7 +523,7 @@ C类地址 = 255.255.255.0
 
 **练习一**: 写出下面的地址的二进制形式，并找出匹配的位。我已写出了它们的前两个8位，以节省你的时间。
 
-| - | - |
+| 网络号 | 二进制形式 |
 | -- | -- |
 | `172.16.50.0` | **10101100.00010000.0**0110010.00000000 |
 | `172.16.60.0` | **10101100.00010000.0**0111100.00000000 |