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CCNA 3 Chapter 1
Introduction to Scaling Networks
Terms in this set (35)
To limit the size of a failure domain in an Enterprise Network, multilayer switches in the distribution layer are usually deployed in pairs with access layer switches between them. What is this design called?
building switch block
Redundant paths in a switched Ethernet network may cause logical Layer 2 loops. Which protocol eliminates the switching loops and disables redundant paths until the path is necessary (such as when a failure occurs)?
STP - Spanning Tree Protocol
If a switch on a network segment fails, the size of the failure domain affects what?
just the hosts on that segment
Define failover capability:
the ability of a device to switch from a non-functioning module, service or device, to a functioning one with little or no break in service
Why would you install duplicate equipment to provide failover services for critical devices?
to prevent the disruption of network services (redundancy)
Enterprise class equipment is designed for reliability, with features such as ? and ?
redundant power supplies
What are redundant paths?
alternate physical paths for data to travel the network - used to prevent the disruption of network services
What are 4 expected features of modern enterprise networks?
Support critical applications
Support converged network traffic
Support diverse business needs
Provide centralized administrative control
What does "port density" refer to?
the number of ports available on a single switch
What are the 3 layers of the 3-layer network hierarchical design model?
What does the access layer do?
provides connectivity for the users
What does the distribution layer do?
forwards traffic from one local network to another
What does the core layer do?
provides a high-speed backbone layer between dispersed networks
Which layer(s) are multilayer switches deployed in?
core & distribution
Smaller enterprise networks may use a 2-layer hierarchical design where the core & distribution layers are collapsed into one layer. What is a benefit of this?
reducing cost and complexity
Define switch forwarding rates:
the processing capabilities of a switch by rating how much data the switch can process per second
What does PoE pass-through do?
draws power from upstream switches to power PoE devices connected to the switch, as well as the switch itself
Does the Cisco Catalyst 2960-C support PoE pass-through?
What abilities does a multilayer switch have?
1. build routing table
2. support a few routing protocols
3. forward IP packets
Which device determines the best path to send packets, connects multiple IP networks, provides redundant paths, connects remote locations, and provides broadcast containment?
What are the 3 categories of routers?
network edge routers
service provider routers
What is a fixed configuration router?
the router interfaces are built-in
What is a modular router?
they have multiple slots that allow the interfaces to be changed, which supports network expansion
What are 3 benefits of extending access layer connectivity thru wireless connectivity?
1. reduced costs
2. increased flexibility
3. ability to grow & adapt to changing network requirements
What is the benefit of organizing traffic on an enterprise network to control traffic patterns and keep traffic local?
What does combining multiple physical Ethernet links into a single, load-balanced EtherChannel configuration accomplish?
increases bandwidth between 2 switches
On a router, what does show cdp neighbors display?
info on directly connected devices such as device ID, interface device is connected to, etc.
What is in-band management of a Cisco device used for?
to monitor and make configuration changes to a network device over a network connection
To configure in-band management to a Cisco device, what 2 things are required?
1. at least one network interface on the device to be connected and operational
2. Telnet, SSH, or HTTP to access a Cisco device
Out-of-band management is used for initial configuration, which requires direct connection to console or AUX port and ?
a terminal emulation client
What are 4 things needed for basic router configuration?
1. hostname for identification
2. passwords for security
3. assign IP addresses to interfaces for connectivity
4. routing protocols to access remote networks
A data center should be built based on switches that promote scalability, operational continuity, and transport flexibility. Which Cisco switches promote infrastructure scalability?
Cisco Nexus switches and Cisco Catalyst 6500 switches
What do Cisco Meraki cloud-managed access switches do?
enable virtual stacking of switches - they monitor and configure thousands of switch ports over the web, without the intervention of onsite IT staff
Which type of router would an enterprise use to allow customers to access content anytime, anyplace, with any device, from home, work, or on the go?
network edge router
Which 2 show commands are used to check a routers configuration?