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Cisco
Cisco Systems, Inc. is a major IT company, which produces networking equipment and network management solutions for both personal and commercial use. Questions about this company and its products belong here.
1,095 Questions
What precaution must you take when redeploying a switch to a new VTP domain in the network?
You must first delete all of its configuration. Higher revision number, for example, on a switch can result in a disaster when re-deployed in a VTP network. However, if all of the switch on the VTP network is set to transparent mode, there should be no problem.
How do you ensure that the correct configurations in a router are saved and backed up?
To save the current running configuration you can use the "copy run start" command. Any configurations that are made on a router will not be saved until you use this command and it will save the current running configuration to the local NVRAM. This configuration will then be used on next startup.
To back up we can save the configuration to a remote TFTP server with use of the "copy run tftp" command. Always have a back up plan.
What is a benefit of using private addressing for the internal LAN?
When an ISP provides Internet service, it provides one publicly routed IP address. Assigning a private IP address to each device in the home or office prevents one device from interfering with Internet access of other devices on the LAN. It also provides greater security for each device.
Public address space is conserved
What are two invalid IP addresses on each subnet?
The first and last IP address on each network.
e.g. In a classful class C network, the IP addresses x.x.x.0 and x.x.x.255 are invalid and cannot be assigned to a network interface card.
x.x.x.0 is the network address for the subnet.
x.x.x.255 is the network broadcast address for the subnet.
DHCP Starvation
Pod is in fact a group. The class room can be organized in pods, for helping the students to form a team. A Pod Host Computer is a host computer from a specific pod.
How many external IP addresses are required to configure PAT?
PAT - Port Address Translation only needs a single IP address for 65,000 connections.
Can I connect a Cisco catalyst 2950 switch to a hub?
Yes.
A hub will be one giant collision domain for that entire switch port. So if its an 8 port hub and you have 8 devices connected to it that collision domain will have 8 devices in it.
What are two purposes for configuring a banner on a router?
One purpose for configuring a banner on a router is to assist in legal prosecution for unauthorized access. Another purpose is to provide a welcome message to users who access the router.
What is one operational characteristic of a shared-media Ethernet network?
1.All frames are transmitted on all Ethernet segments
2. shared medium networks use CSMA/CD to access the medium
It uses ICMP protocol - Internet Control Message Protocol
Is cisco vic2-4fxo hot swappable?
No. You're supposed to power off the router before swapping vic2 cards. Hot swapping the card can cause damage to the router or card. I actually tried this once to see what would happen, luckily neither the router or card were damaged, but the card was not recognized until the router was rebooted.
Who is the girl in the cisco commercial about the doctor visit they call her Ellen in the ad?
Ellen Page
What is the purpose of VTP pruning?
- To restrict traffic on specified trunk lines.
Explanation: By default all the VLANs that exist on a switch are active on a trunk link. VTP pruning allows the switch to not forward user traffic for VLANs that are not active on a remote switch. This feature dynamically prunes unneeded traffic across trunk links. If the VLAN traffic is needed at a later date, VTP will dynamically add the VLAN back to the trunk.
-Rocky
What does a distance vector routing protocol let a router know about remote networks?
The availability of networks, and the metric (or "cost" or "distance") to reach them, according to the system used by the routing protocol to calculate this "metric".
The availability of networks, and the metric (or "cost" or "distance") to reach them, according to the system used by the routing protocol to calculate this "metric".
The availability of networks, and the metric (or "cost" or "distance") to reach them, according to the system used by the routing protocol to calculate this "metric".
The availability of networks, and the metric (or "cost" or "distance") to reach them, according to the system used by the routing protocol to calculate this "metric".
255.255.255.224 would give 32 per subnet
or for ex. 192.168.1.1/27 leaving 5 bits or 2-5th power =32
What end-system command would you use to delete a specific entry from an ARP table?
arp -d ip-address
If you encounter a line protocol down message on a router interface what is is an indication of?
There is a problem with the interface at the data-link layer that prevents it from functioning properly
What information is supplied by Cisco discovery protocol?
CDP v1 includes information for:
Device-ID (Hostname of the device or hardware serial number in ASCII)
Address (The Layer 3 address of the interface that has sent the update)
Port-ID (The port on which the CDP update has been sent)
Capabilities (Describes the functional capabilities of the device)
Version (A character string containing the software version [same as in show version])
Platform (Hardware platform)
CDPv2 offers further information options. Also note that when a device runs CDPv1 it will drop v2 frames.
For more information see provided links.
