300-415 ensdwi pdf

300-415 ensdwi pdf

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Aging Time : 0 mins Fa0/4 7-12 Router#show run ‹ or show ip access lists access-list 1 permit host 172.16.1.1 C 192.168.1.0 is directly connected, Serial0/1/0 RouterA# Router(dhcp-config)#default-router 192.168.1.1 Vlan Mac Address Type Ports Remaining Age R2#show ip route same view of and agree on optimal routes. When convergence takes a long time to occur, intermittent packet loss and loss of connectivity may be experienced between remote networks. In addition to these problems, slow convergence can result in network routing loops and outright network outages. 6.3 below: Voice VLAN: none [Truncated Output] Interface: FastEthernet0/1, Port ID (outgoing port): Switch Holdtime: 143 Copyright (c) 1986-2005 by Cisco Systems, Inc. Compiled Wed 12-Oct-05 22:05 by pt_team The first configuration task when implementing VLAN trunking in Cisco IOS Catalyst switches is to configure the desired interface as a Layer 2 switch port. This is performed by issuing the switchport interface configuration command. 1 link downs, last link down on Mon Mar 01 1993, 00:00:20 ip default-network 1.DHCP Discover packet: When a device boots up and it is configured to obtain an address via DHCP, it sends a broadcast sourced from UDP port 68 (bootpc) out to UDP port 67 (bootps). The packet will reach every device on the network, including any possible DHCP servers located there. There are three commands you can use to statically assign a default route: ip default-gateway Reliability Verify (show) the VTP configuration on both switches Administrative Mode: dynamic desirable Operational Mode: trunk Gateway of last resort is not set <1-15> Stratum number Enabling and Disabling LLDP Routing Concepts Along with subnetting and VLSM, access control lists (ACLs) are one of the bugbear subjects for new Cisco students. Among the problems are learning the IOS configuration commands, understanding ACL rules (including the implicit “deny all” rule), and learning the port numbers and protocol types. Gi0/2 10 5 0 Restrict Total Addresses in System : 5 Before configuring port security, it is recommended that the switch port be statically configured as a Layer 2 access port (it can only be configured on static access or trunk ports, not on dynamic ports). This configuration is illustrated in the following output: Secure Mac Address Table Switch-1(config-if-range)#switchport access vlan 10 Switch-1(config-if-range)#switchport mode access Switch-1(config-if-range)#exit configured to drop the received frames: the network. You saw earlier with the debug ip rip output that RIP broadcasts updates and is classful so it has no concept of VLSM, meaning that if you had a 192.168.1.16/26 network, it would advertise it as 192.168.1.0/24. Also, it offers no authentication, making it an easy target for attackers wanting to inject false route updates into the network. 172.16.x.x network on either side of another network class. If the auto summary feature is enabled, routing issues are guaranteed. Router0#show cdp ? R1#show ip route Inter-VLAN routing issues can come in many forms, especially considering that multiple devices are involved (switches, routers,300-415 ensdwi pdf, etc.) in the process. By following a proper troubleshooting methodology, you should be able to isolate the problem to a particular device and then map it to a specific feature that has been misconfigured. Total Addresses in System : 5 Administrative Mode: dynamic desirable Operational Mode: trunk Learn how to verify and configure CDP and LLDP settings on Cisco switches. Switch-1(config-vlan)#name Example-VLAN-10 Switch-1(config-vlan)#exit neighbor Neighbor list In the example above, you should have put the Deny 172.16.1.1 line at the top, or at least above the Permit 172.16.0.0 statement. Cisco IOS allows the definition of individual static routes using the ip route global configuration command. With this command, you will specify the subnet, the network mask, and the next hop address, that is, the next step in the path toward the destination. In lieu of a next hop address, you may also use the outgoing interface as shown below: Inter-VLAN routing issues can come in many forms, especially considering that multiple devices are involved (switches, routers, etc.) in the process. By following a proper troubleshooting methodology, you should be able to isolate the problem to a particular device and then map it to a specific feature that has been misconfigured. Show the ACLs. Copy and paste into Notepad and make the changes: N2 - OSPF NSSA external type 2, E1 - OSPF external type 1, E2 - OSPF external type 2, E – EGP, i - IS-IS, ---- ----------- ---- ----- ------------ You can also use the following debug commands as part of your troubleshooting process: If Serial 0/0/1 went down due to a link failure, the static route would no l2ptguard Disabled Configure VTP pruning on both switches Router#show cdp neighbor detail Device ID: Switch1 SW1#show interfaces FastEthernet0/1 switchport Name: Fa0/6 that manually configured networks are preferred over routing protocols. The reason for this is, as a network administrator, you will be expected to know your network better than any protocol can and to understand what you want to achieve. By now, it should be clear that you can use static routing with dynamic routing if your needs require it. R2(config)#ntp server 10.0.0.1 There are many types of delay, all of which affect different types of traffic. In general, delay refers to the length of time required to move a packet from its source to its destination through the internetwork. In Cisco IOS software, the interface delay value is in microseconds (µs). Standard numbered ACLs are the most basic form of ACL you can apply to the router. While they are the easiest to configure, they have the most limited range of filters available. They can only filter based on the source IP address or network. The way to recognize a standard ACL is by the number which precedes the configuration lines; these numbers will be from 1 to 99. Switch#show ip ssh DHCP Servers on Cisco Routers Router(dhcp-config)#network 192.168.1.0 255.255.255.0 The following line of configuration will add VTP pruning to your switch: Interface IP-Address OK? Method Status Protocol FastEthernet0/0 10.10.10.2 YES DHCP up up Firstly, make sure that you have a hostname other than the default one, which is Switch. Next, add your domain name (this typically matches your FQDN in Windows Active Directory). Then, create the crypto key that will be used for encryption. The modulus will be the length of the keys you want to use, in the range from 360 to 2048, with the latter being the most secure; 1024 and above is considered secure. At this point, SSH is enabled on the switch.

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