10.10.2 broke wifi in OS X (but not win8 in Parallels)

After upgrading from 10.10.1 to 10.10.2, my MacBook Pro connects to my Apple Extreme via Wifi, but not to the Internet. (On a side note, the Extreme also reports not having an Internet connection.)
However, other devices connected to the Extreme via Wifi, do access the Internet (they run Android, iOS and Windows 8). And on the same Mac that can't reach the Internet, I'm running Parallels Desktop with Windows 8 installed, and here I'm getting a good Internet connection (Parallels is running its network adapter in bridged mode, meaning it's visible to the Extreme as a separate machine).
So, despite the Extreme's odd status, the Internet is available to all my devices, but not Mac OS X. Also, the Mac's wifi hardware must be working, since it's good enough for Parallels on the very same machine.
What is it, then, that's causing OS X to not connect to the Internet?

After Yosemite 10.10.2, the Wifi at work is so broken that I have to open a Terminal to ping 8.8.8.8 to see if I am still online.
My Terminal typically looks like:
64 bytes from 8.8.8.8: icmp_seq=2999 ttl=49 time=981.657 ms
64 bytes from 8.8.8.8: icmp_seq=3000 ttl=49 time=56.346 ms
Request timeout for icmp_seq 3011
Request timeout for icmp_seq 3012
Request timeout for icmp_seq 3013
Request timeout for icmp_seq 3014
Request timeout for icmp_seq 3015
Request timeout for icmp_seq 3016
ping: sendto: No route to host
Request timeout for icmp_seq 3017
ping: sendto: No route to host
Request timeout for icmp_seq 3018
ping: sendto: No route to host
Request timeout for icmp_seq 3019
ping: sendto: No route to host
Request timeout for icmp_seq 3020
ping: sendto: No route to host
Request timeout for icmp_seq 3021
ping: sendto: No route to host
Request timeout for icmp_seq 3022
ping: sendto: No route to host
Request timeout for icmp_seq 3023
ping: sendto: No route to host
Request timeout for icmp_seq 3024
ping: sendto: No route to host
Request timeout for icmp_seq 3025
ping: sendto: No route to host
Request timeout for icmp_seq 3026
Request timeout for icmp_seq 3027
Request timeout for icmp_seq 3028
Request timeout for icmp_seq 3029
Request timeout for icmp_seq 3030
Request timeout for icmp_seq 3031
Request timeout for icmp_seq 3032
Request timeout for icmp_seq 3033
after a while. Then I have to Turn Wifi Off, reconnect Wifi to get online again...

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This question was solved.
View Solution.

Let's add the printer manually since it appears the software is already installed for your USB connection.
Verify that you can browse to the printer's internal web page by typing its IP address into a browser.
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Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Samsung>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : Samsung-PC
Primary Dns Suffix . . . . . . . :
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802.11n PCI
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Physical Address. . . . . . . . . : 00-26-B6-86-AA-8C
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d578:aa58:5b09:e6a5%16(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.64(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 03 November 2012 09:18:19
Lease Expires . . . . . . . . . . : 04 November 2012 09:18:19
Default Gateway . . . . . . . . . : 192.168.1.254
DHCP Server . . . . . . . . . . . : 192.168.1.254
DHCPv6 IAID . . . . . . . . . . . : 285222582
DHCPv6 Client DUID. . . . . . . . :
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DNS Servers . . . . . . . . . . . : 192.168.1.254
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NetBIOS over Tcpip. . . . . . . . : Enabled
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Link-local IPv6 Address . . . . . : fe80::5964:d9f5:c44:93d7%11(Preferred)
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Thanks for being a part of the Apple Support Communities!
Regards,
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10.10.2 broke wifi in OS X (but not win8 in Parallels)

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