cisco 300-410 enarsi book

cisco 300-410 enarsi book

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Access Mode VLAN: 1 (default) ip route 0.0.0.0 0.0.0.0 (Destination IP) 2.Using CDP commands see what information you can gather about the other router. Floating Static Routes neighbors Detailed information on TCP and BGP neighbor connections nsap Address family R1: Show the ACLs. Copy and paste into Notepad and make the changes: In order to practically understand the topics presented in this module, some traffic captures on the devices involved in the examples above will be generated. After the DHCP server is configured and the client workstation boots up, the four-step DHCP process occurs, as can be observed in Figure Switch#show interface trunk Passive interfaces Routing protocol classes Router(config)#int FastEthernet0/0 Router(config-if)#no ip access-group 1 in Router(config-if)#^Z Switch#show int g0/1 switchport Name: Gig0/1 R2(config)#ipv6 route 2001:AAAA:BBBB:DDDD::0/64 f0/0 FE80::C003:8FF:FE2F:0 764 packets output (764 good) Switch#clear cdp table Switch#show cdp neighbors commands are somewhat limited. If you have some out-of-date routers running older IOS versions, then LLDP may not be supported. Based on what you know about CDP, the LLDP output should look very familiar. Most importantly, the interface information, such as local and remote port information, is the same between both protocols and is very useful when analyzing or troubleshooting a network. You can enable LLDP globally or per interface. 8.You won’t be able to ping from edge router to edge router unless you add more static routes which you can if you wish Please bear in mind that both your IOS release and platform (router or switch model) must support LLDP if you want to use it. I only bring this up for those of you using a home lab. LLDP is supported in Packet Tracer but the Switch(config-if)#switchport mode trunk This catches many engineers out. There is an invisible command at the bottom of every ACL. This command is set to deny all traffic which hasn’t been matched yet. The only way to stop this command coming into effect is to configure a “permit all” at the bottom manually. For example, take an incoming packet from IP address 172.20.1.1: Type escape sequence to abort. IA - OSPF inter area, N1 - OSPF NSSA external type 1, <1-65535> Process ID number R1(config)#interface FastEthernet0/0 R2#show ntp associations Router1 Fas 0/1 169 R C1841 Fas 0/0 R1(config-router)#passive-interface f0/1 We will cover how to disable CDP on the device or interface only in the lab. Two other commands are show cdp, which displays protocol information for the device, and show cdp entry ,cisco 300-410 enarsi book, which shows information about a specific device by inputting the name. I recommend that you spend some time checking CDP outputs during the labs you will configure in this guide. * directly connected, via Serial0/1/0 Total entries displayed: 1 Switch#show lldp neighbors detail Port Description: GigabitEthernet0/1 System Name: Switch1 D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 receive Enable LLDP reception on interface transmit Enable LLDP transmission on interface ipv4 Address family Port Description: GigabitEthernet0/1 System Name: R2 Router(config)#ip route 0.0.0.0 0.0.0.0 s0/0 Manual (static) trunk configuration Dynamic Trunking Protocol (DTP) Switch-1(config-if)#switchport port-security maximum 2 4.Set the port security violation action to restrict. 01:26:59: RIP: sending v1 update to 255.255.255.255 via Loopback0 Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: Off R1(config)#ip default-gateway 172.16.1.1 Switch(config)#vtp mode server ‹this is on by default Switch(config)#vtp domain passhot R 192.168.1.4/30 [120/1] via 172.16.1.1, 00:00:11, FE0/0 Vlan Mac Address Type Ports Remaining Age CRC or other types of errors on device interfaces Routing table information Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Sending updates every 30 seconds, next due in 21 seconds Invalid after 180 seconds, holddown 180, flushed after 240 Redistributing: rip Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds: commands are somewhat limited. If you have some out-of-date routers running older IOS versions, then LLDP may not be supported. Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) isl - Interface uses only ISL trunking encapsulation when trunking DHCP offers 256 option values, from which only 254 are usable because 0 is the pad option and 255 is the end option. Many DHCP options are commonly known parameters used often, including: 3.6.bNetwork route Challenge 1 – Switch Security Lab BranchRouter(config)#ip route 192.168.1.0 255.255.255.0 96.96.96.1 Router#show ip interface brief default; however, you might want to disable them just to make sure. Some services are helpful as well. The majority of services are found under the command service in Global Configuration mode. function is to discover attached Cisco devices. You may not want other Cisco devices to see information about your network devices, so you can turn this off, at least on the devices at the edge of your network which connect to other companies or your ISP. Take today’s exam R1#show ipv6 route static Maximum number of concurrent server connections allowed: 16 Server idle time-out: 180 seconds 3.Set all passwords to be encrypted with level 7 encryption. R2#show ntp status EIGRP uses the interface delay value as part of its metric calculation. Manually adjusting the interface delay value results in the recomputation of the EIGRP metric. The ports connecting the switch to the router are usually trunk ports 3.Configure a trunk link between the switch and router using dot1q. D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area, N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2, E1 - OSPF external type 1, E2 - OSPF external type 2, Instructions CDP need to be running on the switch but it is enabled by default. This catches many engineers out. There is an invisible command at the bottom of every ACL. This command is set to deny all traffic which hasn’t been matched yet. The only way to stop this command coming into effect is to configure a “permit all” at the bottom manually. For example, take an incoming packet from IP address 172.20.1.1: TOT/TAT/TNT: 802.1Q/802.1Q/802.1Q 　　Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Other issues outside the CCNA syllabus include authentication mistakes and route filtering. You could be asked about split horizon (covered earlier), exceeding the maximum hop count, or a firewall blocking RIP traffic. Also, bear in mind that ACLs filter all traffic not specifically permitted. We cover permitting RIP via an ACL entry in the ACL section. Time remaining: 100 seconds Now, assume that Host 1 has been compromised by an attacker who wants to receive all traffic destined for Host 2. By using MAC address spoofing, the attacker crafts an Ethernet frame using the source address of Host 2. When the switch receives this frame, it notes the source MAC address and overwrites the CAM table entry for the MAC address of Host 2, and points it to port FastEthernet0/1 instead of FastEthernet0/2, where the real Host 2 is connected. This concept is illustrated below in Figure 9.

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