Connecting Networks Version 6 – CN Chapter 4 Exam

Connecting Networks (Version 6.00) – CN Chapter 4 Exam

What is the function of ASICs in a multilayer switch??

They prevent Layer 2 loops by disabling redundant links between switches.

They provide power to devices such as IP phones and wireless access points through Ethernet ports.

They streamline forwarding of IP packets in a multilayer switch by bypassing the CPU.*

They aggregate multiple physical switch ports into a single logical port.

ASICs are application-specific integrated circuits and they allow a multilayer switch to forward IP packets without calling on the CPU to make routing decisions. By using ASICs a switch can forward IP packets almost as fast as it can forward Layer 2 frames.


Which two VTP modes allow for the creation, modification, and deletion of VLANs on the local switch? (Choose two.)


The three VTP modes are server, client, and transparent. In server VTP mode, the switch can create, modify, and delete VLANs and send this information on to other switches that are in the same VTP domain. Switches in transparent VTP mode can do the same except that information is not transmitted to other switches.


Fill in the blank.
What is the acronym of an IGP, link-state, classless routing protocol besides IS-IS? ______
Correct Answer: OSPF*

IS-IS is a link state IGP routing protocol that supports classless routing. It is commonly used by ISPs and carriers.


Refer to the exhibit. The routing table on R2 does not include all networks that are attached to R1. The network administrator verifies that the network statement is configured to include these two networks. What is a possible cause of the issue?

The AS number does not match between R1 and R2.

The network statements should include the wild card mask.

The interfaces that are connected to these two networks are configured as passive interfaces.

The no auto-summary command is missing in the R1 configuration.*

The fact that R2 has a route to from R1 indicates that EIGRP is functioning, which excludes the issue of an AS number not matching. The issue is that both sides have a network within the Class B network. Therefore, automatic network summarization must be disabled by the no auto-summary command. If this command is not used, the network statement with a wild card mask will not have effect. The passive interface, if configured, will prevent EIGRP updates from entering the two networks, but not prevent R1 from advertising them to R2.


Which type of OSPF LSA represents an external route and is propagated across the entire OSPF domain?type 1

type 2

type 3

type 4

type 5*

Type 5 LSAs are used for external routes and are generated by an ASBR. They are forwarded into other areas by ABRs.


Refer to the exhibit. What are three results for the DR and BDR elections for the given topologies? (Choose three.)

R3 is DR for segment A.

R3 is BDR for segment A.*

R2 is BDR for segment A.

R1 is DR for segment A.*

R5 is BDR for segment B.*

R4 is DR for segment B.

Without ties between them, the elections took place based only on interface priorities.


Refer to the exhibit. What can be concluded about network in the R2 routing table?

This network was learned through summary LSAs from an ABR.*

This network is directly connected to the interface GigabitEthernet0/0.

This network should be used to forward traffic toward external networks.

This network has been learned from an internal router within the same area.

n a routing table, the designation O IA means the entry was learned from an interarea LSA that was generated from an ABR. The C label indicates a network that is directly connected to an interface on the router. The O label indicates a network that is advertised by another router in the same area. The label O*E2 indicates an external network. In this case, the network designation of indicates that this external network is the default route for all traffic that is destined for external networks.


Refer to the exhibit. A network administrator has connected two switches together using EtherChannel technology. If STP is running, what will be the end result?

The resulting loop will create a broadcast storm.

STP will block one of the redundant links.*

The switches will load balance and utilize both EtherChannels to forward packets.

Both port channels will shutdown.

Cisco switches support two protocols for negotiating a channel between two switches: LACP and PAgP. PAgP is Cisco-proprietary. In the topology shown, the switches are connected to each other using redundant links. By default, STP is enabled on switch devices. STP will block redundant links to prevent loops.


What are two reasons to implement passive interfaces in the EIGRP configuration of a Cisco router? (Choose two.)

to provide increased network security*

to exclude interfaces from load balancing

to shut down unused interfaces

to mitigate attacks coming from the interfaces

to avoid unnecessary update traffic*

Two primary reasons for implementing passive interfaces in EIGRP routing are to suppress unnecessary update traffic, such as when an interface is a LAN interface with no other routers connected, and to increase security controls, such as preventing unknown rogue routing devices from receiving EIGRP updates.


Which model and which two characteristics would be more likely to be considered in purchasing an access layer switch, as compared to buying switches that operate at the other layers of the Cisco hierarchical design model? (Choose three.)

Catalyst 4500X
Catalyst 2960*
number of ports*

Access layer switches are cheaper and do not have as many ports or features as the switches that work at the distribution or core layers. The number of ports that are needed depends on the number of wired devices in the area. Access layer switches tend to be fixed configuration switches that have a set number of ports. Ports on access layer switches tend to operate at 100 or 1000 Mb/s. Switches that operate at all three design layers are capable of EtherChannel and RSTP. The Catalyst 4500X model switch is used at the core design layer.

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