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cisco ccna ceh certified ethical hacker ipv4 router network protocols ios icmp dhcp ssh smb social engineering seh worm routing switch trojan penetration testing dns communication link-state pen test subnet mask client and server lan media virus configure ospf wide area networks protocol analysis physical security password show cdp neighbors tracert ping redundancy firewall telnet application layer osi www subnet ipv6 vlsm ieee 802.1q vtp black-hole vlan default vlan trunk virtual local area network switchport mode trunk native vlan broadcast domain show vlan brief vlan flash cdp duplex write memory security post mac flooding ram nvram mac power on self test copy running-config startup-config access distribution core reconnaissance attacks commands packet mac address modular switch configuration hub switching arp fiber-optic physical layer utp ethernet device connectivity small to medium-sized business network sme network communications cli ios command network infrastructure wan intranet and extranet topology diagram introduction to networks qos end device peer-to-peer internet multicast broadcast supernetting unicast subnetting traceroute ip end-to-end transport layer server transmissions session tcp client udp data packet header configurations encapsulation de-encapsulating small-to-medium-sized segment modular layer 3 switch frame backdoor anti-malware software botnet trojan concept malware threats password cracking explot rootkits escalating privileges gaining access clearing logs steganography system hacking snmp snmp enumeration enumeration tcp port ids evasion scanning network banner grabbing ids ip spoofing footprinting reconnaissance cehv9 doxing zero-day attack bot daisy chaining payload check for live system host discovery nmap cryptography cloud computing firewalls evading ids firewalls and honeypots honeypots hacking mobile platforms hacking wireless networks sql injection information gathering hacking web applications mitm apache hacking webservers web server session hijacking stealing brute force hulk denial of-service davoset ddos mac spoofing arp poisoning mac attack pen testing dhcp attack is-is rip dynamic routing protocols ripng dynamic routing route summarization cidr routing protocol classful network addressing default gateway show ip route next-hop ip route command static routing layer 3 switching encapsulation dot1q inter-vlan routing multilayer switch show ip interface switchport access vlan switchport mode tr show running-config subinterface administrative distance static routes routing table remote network vlan id switchport mode access mls sniffing exploit vulnerability hack value nature network address translation access control list extended acls tcp conversation packet filtering wildcard mask standard acls acl bandwidth passive interface rid ospf accumulates costs ospf network topology single-area and multiarea ospf loopback interface cost hello packet metrics link-state updates establish neighbor adjacencies bdr router id encapsulating dr distance vector