diff --git a/notes/.obsidian/plugins/obsidian-activity-history/data.json b/notes/.obsidian/plugins/obsidian-activity-history/data.json
index 86d1b80..2bf63b0 100644
--- a/notes/.obsidian/plugins/obsidian-activity-history/data.json
+++ b/notes/.obsidian/plugins/obsidian-activity-history/data.json
@@ -13,7 +13,7 @@
     {
       "path": "/",
       "date": "2022-02-02",
-      "size": 746124
+      "size": 748443
     }
   ],
   "activityHistory": [
@@ -58,7 +58,7 @@
         },
         {
           "date": "2022-02-02",
-          "value": 3904
+          "value": 6223
         }
       ]
     }
diff --git a/notes/har/BIOS.md b/notes/har/BIOS.md
index cb20a13..f23f069 100644
--- a/notes/har/BIOS.md
+++ b/notes/har/BIOS.md
@@ -12,6 +12,19 @@ Master boot record.
 Partition table na disku (rozdělení na části disků, umožňuje více file systému a další rozdělení)
 ## POST
 Power on self test
+Beep Code
+
+## 3 vrstvy
+### První vrstva
+Flash ROM, dříve EEP ROM
+musí být hned dostupná po startu.
+detekuje HW
+### Druhá vrstva
+CMOS čip, ukládá set nastavení BIOS a čas.
+### Třetí vrstva
+Ovladače jádra OS
+Jsou uloženy v základní desce, rozšiřující kartách, v pamětech, v procesoru
+zavádějí se v průběhu spouštění systému.
 
 # UEFI
 Novější verze BIOSu.
diff --git a/notes/kbb/tools/arp-scan.md b/notes/kbb/tools/arp-scan.md
new file mode 100644
index 0000000..9dcd23d
--- /dev/null
+++ b/notes/kbb/tools/arp-scan.md
@@ -0,0 +1,16 @@
+# arp-scan
+```
+Send ARP packets to hosts (specified as IP addresses or hostnames) to scan the local network. More information: https://github.com/royhills/arp-scan.
+
+ - Scan the current local network:
+   arp-scan --localnet
+
+ - Scan an IP network with a custom bitmask:
+   arp-scan {{192.168.1.1}}/{{24}}
+
+ - Scan an IP network within a custom range:
+   arp-scan {{127.0.0.0}}-{{127.0.0.31}}
+
+ - Scan an IP network with a custom net mask:
+   arp-scan {{10.0.0.0}}:{{255.255.255.0}}
+```
diff --git a/notes/kbb/tools/nmap.md b/notes/kbb/tools/nmap.md
new file mode 100644
index 0000000..5d6015f
--- /dev/null
+++ b/notes/kbb/tools/nmap.md
@@ -0,0 +1,30 @@
+# nmap
+Network map
+
+```
+Network exploration tool and security / port scanner.Some features only activate when Nmap is run with privileges.More information: https://nmap.org.
+
+ - Check if an IP address is up, and guess the remote host's operating system:
+   nmap -O {{ip_or_hostname}}
+
+ - Try to determine whether the specified hosts are up and what their names are:
+   nmap -sn {{ip_or_hostname}} {{optional_another_address}}
+
+ - Like above, but also run a default 1000-port TCP scan if host seems up:
+   nmap {{ip_or_hostname}} {{optional_another_address}}
+
+ - Also enable scripts, service detection, OS fingerprinting and traceroute:
+   nmap -A {{address_or_addresses}}
+
+ - Assume good network connection and speed up execution:
+   nmap -T4 {{address_or_addresses}}
+
+ - Scan a specific list of ports (use -p- for all ports 1-65535):
+   nmap -p {{port1,port2,…,portN}} {{address_or_addresses}}
+
+ - Perform TCP and UDP scanning (use -sU for UDP only, -sZ for SCTP, -sO for IP):
+   nmap -sSU {{address_or_addresses}}
+
+ - Perform full port, service, version detection scan with all default NSE scripts active against a host to determine weaknesses and info:
+   nmap -sC -sV {{address_or_addresses}}
+```
diff --git a/notes/kbb/tools/tools.md b/notes/kbb/tools/tools.md
index 21b82fe..437eff8 100644
--- a/notes/kbb/tools/tools.md
+++ b/notes/kbb/tools/tools.md
@@ -7,5 +7,7 @@ type: folder_brief_live
 imagePrefix: 'data/'
 ```
 %% Zoottelkeeper: Beginning of the autogenerated index file list  %%
+-  [[kbb/tools/arp-scan|arp-scan]]
+-  [[kbb/tools/nmap|nmap]]
 -  [[kbb/tools/SQLMap|SQLMap]]
 %% Zoottelkeeper: End of the autogenerated index file list  %%