The hacking threat your computer is exposed to when there are too many ports open. The good news is that the default Windows 8 install has only one port open, see the seventh scanned device below.
John Engelbrecht Grovetown GA Ubuntu computer GRID using the Linux command for network mapping
file name: NMAP on home network looking for open ports that could be hacked.txt notes added
sudo nmap -FO 192.168.1.0-254
Starting Nmap 5.00 ( http://nmap.org ) at 2015-06-22 05:19 EDT
1 of 7: Interesting ports on 192.168.1.1:
PORT STATE SERVICE
80/tcp open http
MAC Address: 00:06:25:BE:E3:27 (The Linksys Group)
Device type: WAP
Running: Linksys embedded
OS details: Linksys BEFW11S4 WAP, WAP being used only for the switch ports, positioned between Knology (WOW) cable modem and the home network
Network Distance: 1 hop
2 of 7: Interesting ports on 192.168.1.31 assigned statically:
PORT STATE SERVICE
21/tcp open ftp
23/tcp open telnet
80/tcp open http
139/tcp open netbios-ssn
515/tcp open printer
MAC Address: 00:03:1B:58:01:A3 (Cellvision Systems)
Device type: print server
Running: D-Link embedded, Hamlet embedded
OS details: D-Link DP-300U, DP-G310, or Hamlet HPS01UU PRINT SERVER servicing old HP Laserjet 2300 that has only USB port, no Ethernet port
Network Distance: 1 hop
3 of 7: Interesting ports on 192.168.1.100:
PORT STATE SERVICE
80/tcp open http
443/tcp open https
MAC Address: 58:35:D9:94:47:56 (Unknown)
No exact OS matches for host
Network Distance: 1 hop
computer tips seminar handout June 22 2015.odt ©John Engelbrecht 2015
4 of 7: All 100 scanned ports on 192.168.1.101 are filtered
MAC Address: 44:94:FC:90:02:3D (Unknown)
Netgear N300 wireless router WNR2000
Network Distance: 1 hop
5 of 7: Interesting ports on 192.168.1.102:
PORT STATE SERVICE
631/tcp open ipp
MAC Address: 00:1F:1F:F7:D7:64 (Edimax Technology Co.)
Device type: Ethernet hub
Running: Linux 2.6.X
OS details: Linux 2.6.13 - 2.6.27
Network Distance: 1 hop
6 of 7: Interesting ports on 192.168.1.103:
PORT STATE SERVICE
111/tcp open rpcbind
139/tcp open netbios-ssn
445/tcp open microsoft-ds
631/tcp open ipp
2049/tcp open nfs
5900/tcp open vnc
No exact OS matches for host, may be Cisco layer-3 switch
Network Distance: 0 hops
7 of 7: Interesting ports on 192.168.1.104:
PORT STATE SERVICE
5357/tcp open unknown Just one port is open on this Windows 8.1 installation
MAC Address: D4:3D:7E:91:4B:92 (Unknown)
Running: Microsoft Windows 8.1
Network Distance: 1 hop
OS detection performed.
Nmap done: 255 IP addresses (7 hosts up) scanned in 74.09 seconds