Chapter 4: Switched Networks (NetAcad) (Exam)
Characteristic of cut-through forwarding:
-appropriated for high performance computing applications -forwarding process can begin after receiving the destination address -may forward invalid frames
Characteristic of store-and-forward forwarding:
-error checking before forwarding -forwarding process only begins after receiving the entire frame -only forwards valid frames
Functions of the distribution layer:
-implements network access policy -establishes Layer 3 routing boundaries
What two criteria are used by a Cisco LAN switch to decide how to forward Ethernet frames? (Choose two.)
-ingress port -destination MAC address
What are two advantages of modular switches over fixed-configuration switches? (Choose two.)
-need for fewer power outlets -increased scalability
Functions of the core layer:
-provides high-speed backbone connectivity -functions as an aggregator for all the campus blocks
Functions of the access layer:
-represents the network edge -provides network access to the user
A network designer must provide a rationale to a customer for a design which will move an enterprise from a flat network topology to a hierarchical network topology. Which two features of the hierarchical design make it the better choice?
-simpler deployment for additional switch equipment -easier to provide redundant links to ensure higher availability
What are two reasons a network administrator would segment a network with a Layer 2 switch? (Choose two.)
-to enhance user bandwidth -to isolate traffic between segments
Which two previously independent technologies should a network administrator attempt to combine after choosing to upgrade to a converged network infrastructure? (Choose two.)
-user data traffic -VoIP phone traffic
8
A central router is connected to four other routers. Each of the four routers has a LAN that is connected to it. Each LAN has a different number of hosts. Refer to the exhibit. How many broadcast domains are displayed?
What is the destination address in the header of a broadcast frame?
FF-FF-FF-FF-FF-FF
SW1 floods the frame on all ports on the switch, excluding the interconnected port through which the frame entered the switch
PCA attaches to SW1 through port Fa0/1. PCB attaches to SW1 through port Fa0/2. The Fa0/23 port of SW1 attaches to the Fa0/24 port of SW2. PCc attaches to SW2 through port Fa0/3. PCD attaches to SW2 through port Fa0/4. Refer to the exhibit. How is a frame sent from PCA forwarded to PCC if the MAC address table on switch SW1 is empty?
to Fa0/1, Fa0/2, and Fa0/3 only
Refer to the exhibit. Consider that the main power has just been restored. PC3 issues a broadcast IPv4 DHCP request. To which port will SW1 forward this request?
A small publishing company has a network design such that when a broadcast is sent on the LAN, 200 devices receive the transmitted broadcast. How can the network administrator reduce the number of devices that receive broadcast traffic?
Segment the LAN into smaller LANs and route between them.
Which statement describes a result after multiple Cisco LAN switches are interconnected?
The broadcast domain expands to all switches
What is a collapsed core in a network design?
a combination of the functionality of the distribution and core layers
Which solution would help a college alleviate network congestion due to collisions?
a high port density switch
What is a basic function of the Cisco Borderless Architecture distribution layer?
aggregating Layer 3 routing boundaries
A __________ network is one that uses the same infrastructure to carry voice, data, and video signals.
converged
What is one function of a Layer 2 switch?
determines which interface is used to forward a frame based on the destination MAC address
What is a definition of a two-tier LAN network design?
distribution and core layers collapsed into one tier, and the access layer on a separate tier
A local law firm is redesigning the company network so that all 20 employees can be connected to a LAN and to the Internet. The law firm would prefer a low cost and easy solution for the project. What type of switch should be selected?
fixed configuration
allows intelligent traffic load sharing by using all network resources
flexibility
facilitates understanding the role of each device at every tier, simplifies deployment, operation, management, and reduces fault domains at every tier
hierarchical
allows seamless network expansion and integrated service enablement on an on-demand basis
modularity
satisfies user expectations for keeping the network always on
resiliency
Which network device can serve as a boundary to divide a Layer 2 broadcast domain?
router
Which type of address does a switch use to build the MAC address table?
source MAC address
Which network device can be used to eliminate collisions on an Ethernet network?
switch
What does the term "port density" represent for an Ethernet switch?
the number of available ports
