Review Questions

1.	You work for a large company that needs to connect four buildings with a high-speed, high- bandwidth backbone. They are all on the same city block, and fiber already connects the buildings. There are multiple departments in each building and all run multiple protocols. The company already owns Cisco Catalyst 6000 series switches, which you can use for the distribution layer. What switch should you use for the core layer? 2950 4000 6500 8500
2.	You need to install a large switched network for a company that has already defined its business requirements to be gigabit-speed data transfer, high availability, and ISL routing to the server farms for all 300 users. What switch would you install for the distribution layer? 2950 with gigabit uplinks 4000 series 3550 series 6000 series with a 16-port gigabit module 8500 series with gigabit uplinks
3.	You just have been hired as a consultant for a small company that has users distributed across many floors in the same building. Servers for the company are all located on the first floor, and 30 users access them from various parts of the building. What switch would you install for the access layer connection? 2950 3550 series 6000 8000
4.	You have just been promoted to network manager (congratulations!) for a large company. You need to connect four switch blocks; each contains 1500 users. You want to control broadcast domains at the switch blocks and use ISL to trunk between them. What switch would you purchase for the distribution layer? 2950 with gigabit links 3550 series 4000 with gigabit VLAN Catalyst 6000 with 16-port gigabit module
5.	Which layer must be efficient and do nothing to slow down packets as they traverse the backbone? Access Distribute Distribution Backbone Core
6.	Which of the following switches are recommended for use in the core? (Choose all that apply.) 3550 series 4000 series 6500 8500
7.	Which of the following is the main factor in determining the size of your core? Routing protocols Routed protocols IP broadcasts ARPs ICMP redirects Number of distribution layer switches
8.	The number of switches that can collapse from the access layer to the distribution layer depends on what? (Choose all that apply.) Traffic patterns Routers at the distribution layer Number of users connecting to the core layer Number of users connected to the access layer switches Number of distribution layer switches Distance VLANs must traverse the network Spanning tree domain size
9.	Which of the following is generally performed at the distribution layer? (Choose all that apply.) Breaking up of collision domains No packet filtering Access lists, packet filtering, and queuing Routing between VLANs
10.	Which of the following is also generally performed at the distribution layer? (Choose all that apply.) Broadcast and multicast domain definition Security and network policies Redistribution between routing protocols User access to the network
11.	Which of the following is true regarding the access layer? (Choose all that apply.) This is where users gain access to the internetwork. The switches deployed at this layer must be able to handle connecting individual desktop devices to the internetwork. It is the aggregation point for multiple access switches. It can participate in MLS and handle a router processor.
12.	Which of the following series of switches are suggested for use at the access layer? (Choose all that apply.) 2950 3550 series 4000 series 6000 8000
13.	Which of the following Cisco switches provides a 10/100/1000Mbps advanced high-performance enterprise solution for up to 96 users and up to 36 Gigabit Ethernet ports for servers? 2950 3550 series 4000 series 6000 8000
14.	Which of the following switches runs IOS by default? (Choose all that apply.) 2950 3550 series 4000 series 6000
15.	Which of the following switches provides switched 10Mbps to the desktop or to 10BaseT hubs in small-to-medium campus networks? 2950 3550 series 4000 series 6000
16.	Which layer of switching makes no modification of the data packet? Layer 2 Layer 3 Layer 4 MLS
17.	Layer 2 switching is ___________________. (Choose all that apply.) Software based Hardware based Wire speed Asymmetrical Filtered using ASICs
18.	Which Cisco switch can provide up to 384 10/100Mbps Ethernet connections, 192 100FX FastEthernet connections, or 130 Gigabit Ethernet ports? 2950 3550 series 4000 series 6000
19.	Which of the following describes Cisco Catalyst 3550 series switches? They provide an enterprise solution for up to 96 users and up to 36 Gigabit Ethernet ports for servers. They run IOS in a mid-range switch with internal routing capability. They only use an external router processor such as a 4000 or 7000 series router. The 3550 series is the Catalyst low-end model.
20.	Which of the following is true regarding the distribution layer switches? (Choose all that apply.) The distribution layer is the aggregation point for multiple access switches. This is where users gain access to the internetwork. The switches deployed at this layer must be able to handle connecting individual desktop devices to the internetwork. The distribution layer can participate in MLS and handle a router processor.

Answers

1.	D A Cisco 6500 or 8500 switch is recommended at the core, and even though only one of those switches might be sufficient to handle the traffic, Cisco recommends two switches for redundancy and load balancing. You could consider a 4000 or a 3550 Catalyst switch if you don’t need the power of the 6500 or the 8500. Because the customer is using 6500 at the distribution layer, you should use 8500s as the core switches. D is the best answer.
2.	C The Catalyst 6000 can provide up to 384 10/100Mbps Ethernet connections, 192 100FX FastEthernet connections, or 130 Gigabit Ethernet ports. Because there are 300 users, the 6000 series would be a good fit. The 8500 is a recommended core switch, and the question asks for an access layer/distribution layer solution.
3.	A A 3550 series switch might be overkill for the needs of the company. Because the question involves a small company and no growth was specified, a couple of 2950s would be the most cost-effective solution.
4.	B In this instance, the 3550 series have a number of switches capable of supporting the required layer 3 services.
5.	E The core layer should be designed to connect distribution layer devices. No packet manipulation should occur at this layer.
6.	C, D The core layer needs very fast switches to move data as quickly as possible between distribution layer devices.
7.	A Routing protocols are protocols that are used to update routers with network information. Routed protocols are used to send user data through an internetwork.
8.	A, B, D, F, G Traffic patterns, the number of routers, the number of users connected into access layer switches, distance, and spanning tree size are all factors that contribute to the number of switches that can collapse from the access layer to the distribution layer.
9.	C, D The distribution layer performs routing, which breaks up broadcast domains. Routers can be configured with access lists, packet filters, and queuing.
10.	A, B, C The distribution layer performs routing, which breaks up broadcast domains by default. Security can be performed as well as network policies implemented. Routing protocols can be redistributed with most Cisco routers.
11.	A, B The access layer breaks up collision domains and connects the access layer to the internetwork by connecting to the distribution layer.
12.	A, B, C Any switches from the 2950 series to the 4000 series can work at the access layer.
13.	C The Cisco 4000 series was created for high performance, up to 36 gigabit ports, and 96-user connectivity.
14.	A, B Both the 2950 and the 3550 runs IOS. The 4000 and 6000 can be upgraded from the default CatOS.
15.	A The 2950 is the current entry model that provides 10Mbps switched networking with up to 24 ports.
16.	A The Data Link layer (layer 2) encapsulates the packet but does not make any changes to it.
17.	B, C, E Layer 2 switching is considered hardware based because it uses an ASIC chip to make filtering decisions. It is also considered wire speed because no modification to the data packet takes place.
18.	D The Cisco Catalyst 6000 series provides up to 384 10/100Mbps Ethernet ports for user connectivity. It can also provide 192 100Mbps FastEthernet fiber uplinks or 130 Gigabit Ethernet ports.
19.	B The 3550 series Catalyst switches are the new kid on the block. With a range of different interface options from 10Mbps to gigabit speeds, they run IOS and perform full MLS internally.
20.	A, D The distribution layer connects the access layer devices, performs routing, and can provide multi-layer switching.