Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Other routers, switches, and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers.
Note: With modern networking devices, a straight-through cable can often be used even when connecting like devices because of their autosensing feature. With autosensing, the interfaces detect whether the send and receive circuit pairs are correctly connected. If they are not, the interfaces reverse one end of the connection. Autosensing also alters the speed of the interfaces to match the slowest one. For example, if connecting a Gigabit Ethernet (1000 Mb/s) router interface to a Fast Ethernet (100 Mb/s) switch interface, the connection uses Fast Ethernet.
Because computers talk in numbers, rather than words, routers are uniquely identified using IP addresses (numbers with the format x.x.x.x). The tracert tool shows you what path through the network a packet of information takes to reach its final destination. The tracert tool also gives you an idea of how fast traffic is going on each segment of the network. Three packets are sent to each router in the path, and the return time is measured in milliseconds. Now use this information to analyze the tracert results to
The network has been designed and configured to support three VLANs. Inter-VLAN routing is provided by an external router using an 802.1Q trunk, also known as router-on-a-stick. Routing to a remote web server, which is simulated by Lo0, is also provided by R1. However, it is not working as designed, and user complaints have not given much insight into the source of the problems.
NetFlow is a Cisco IOS technology that provides statistics on packets flowing through a Cisco router or multilayer switch. NetFlow enables networkand security monitoring, network planning, traffic analysis, and IP accounting. It is important not to confuse NetFlow’s purpose and results with that of packet capture hardware and software. Packet capturing records all possible information exiting or entering a network device for later analysis, NetFlow targets specific statistical information.
e. Because the ASA inside interface (VLAN 1) is set to a security level of 100 (the highest) and the DMZ interface (VLAN 3) is set to 70, you can also access the DMZ server from a host on the inside network. The ASA acts like a router between the two networks. Ping the DMZ server (PC-A) internal address (192.168.2.3) from inside network host PC-B (192.168.1.X). The pings should be successful due to the interface security level and the fact that ICMP is being inspected on the inside interface by the global inspection policy. The pings from PC-B to PC-A do not affect the NAT translation counts, because both PC-B and PC-A are behind the firewall and no translation takes place.
c. The Tera Term log file will create a record of every command issued and every output displayed. Note: You can use this feature to capture the output from several commands in sequence and use it for network documentation purposes. For example, you could issue the show version, show ip interface brief, and show running-config commands to capture information about the router.
b. The Follow TCP Stream window displays the data for your Telnet session with the router. The entire session is displayed in clear text, including your password. Notice that the username and show run command that you entered are displayed with duplicate characters. This is caused by the echo setting in Telnet to allow you to view the characters that you type on the screen.
Note: The router commands and output in this lab are from a Cisco 1841 router using Cisco IOS software, release 15.1(4)M8 (Advanced IP Services image). The switch commands and output are from Cisco WS- C2960-24TT-L switches with Cisco IOS Release 15.0(2)SE4 (C2960-LANBASEK9-M image). Other routers, switches, and Cisco IOS versions can be used. See the Router Interface Summary Table at the end of the lab to determine which interface identifiers to use based on the equipment in the lab. Depending on the router, or switch model and Cisco IOS version, the commands available and output produced might vary from what is shown in this lab.
The Cisco Switch Database Manager (SDM) provides multiple templates for the Cisco 2960 switch. The templates can be enabled to support specific roles depending on how the switch is used in the network. In this lab, the sdm lanbase-routing template is enabled to allow the switch to route between VLANs and to support static routing.
The Dynamic Host Configuration Protocol (DHCP) is a network protocol that lets network administrators manage and automate the assignment of IP addresses. Without DHCP, the administrator must manually assign and configure IP addresses, preferred DNS servers, and default gateways. As the network grows in size, this becomes an administrative problem when devices are moved from one internal network to another. In this scenario, the company has grown in size, and the network administrators can no longer assign IP addresses to devices manually. Your job is to configure the R2 router to assign IPv4 addresses on two different subnets connected to router R1.
“Wiki” is a Hawaiian-language word that means fast. In networking terms, a wiki is a web-based collaboration tool that permits almost anyone to immediately post information, files, or graphics to a common site for other users to read and modify. A wiki provides access to a home page that has a search tool to assist you in locating the articles that interest you. A wiki can be installed for the Internet community or behind a corporate firewall for employee use. The user not only reads wiki contents, but also participates by creating content within a web browser.
Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Other routers, switches and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers.
Why is it a good idea to verify that OSPF is functioning correctly before configuring OSPF authentication? _______________________________________________________________________________________ _______________________________________________________________________________________ Troubleshooting OSPF problems is much easier if OSPF adjacencies have been established and verified before implementing authentication. You then know that your authentication implementation is flawed, as adjacencies do not re-establish.
VLANs provide logical segmentation within an internetwork and improve network performance by separating large broadcast domains into smaller ones. By separating hosts into different networks, VLANs can be used to control which hosts can communicate. In this lab, a school has decided to implement VLANs in order to separate traffic from different end users. The school is using 802.1Q trunking to facilitate VLAN
To establish connectivity between the host and the switch, the ports used by the host must be in the same VLAN as the switch. Notice in the above output that the VLAN 1 interface goes down because none of the ports are assigned to VLAN 1. After a few seconds, VLAN 99 comes up because at least one active port (F0/6 with PC-A attached) is now assigned to VLAN 99.
2 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable) 1 Switch (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable) 2 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term) Console cables to configure the Cisco IOS devices via the console ports
When given a network topology, it is important to be able to determine the number of subnets required. In this lab, several scenario topologies will be provided, along with a base network address and mask. You will subnet the network address and provide an IP addressing scheme that will accommodate the number of subnets displayed in the topology diagram. You must determine the number of bits to borrow, the number of hosts per subnet, and potential for growth as specified by the instructions.
Number of Subnets Created 512 Number of Host Bits per Subnet 15 Number of Hosts per Subnet 32,766 Network Address of this Subnet 10.101.0.0 IPv4 Address of First Host on this Subnet 10.101.0.1 IPv4 Address of Last Host on this Subnet 10.101.127.254 IPv4 Broadcast Address on this Subnet 10.101.127.255 c. Problem 3:
1 Router (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable) 1 Switch (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable) 2 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term) Console cables to configure the Cisco IOS devices via the console ports