CCNA Routing and Switching v3.0

 

QUESTION 61

Refer to the exhibit. The network administrator normally establishes a Telnet session with the switch from host A. However, host A is unavailable. The administrator’s attempt to telnet to the switch from host B fails, but pings to the other two hosts are successful. What is the issue?

 

clip_image002

A.

Host B and the switch need to be in the same subnet.

B.

The switch interface connected to the router is down.

C.

Host B needs to be assigned an IP address in VLAN 1.

D.

The switch needs an appropriate default gateway assigned.

E.

The switch interfaces need the appropriate
IP addresses assigned.

 

Correct Answer: D

Explanation:

Ping was successful form host B to other hosts because of intervlan routing configured on router. But to manage switch via telnet the VLAN32 on the switch needs to be configured interface vlan32 along with ip address and its appropriate default-gateway address. Since VLAN1 interface is already configure on switch Host A was able to telnet switch.

 

 

QUESTION 62

Which two link protocols are used to carry multiple VLANs over a single link? (Choose two.)

 

A.

VTP

B.

802.1q

C.

IGP

D.

ISL

E.

802.3u

 

Correct Answer: BD

Explanation:

Cisco switches can use two different encapsulation types for trunks, the industry standard 802.1q or the Cisco proprietary ISL. Generally, most network engineers prefer to use 802.1q since it is standards based and will interoperate with other vendors.

 

 

QUESTION 63

Which two states are the port states when RSTP has converged? (Choose two.)

 

A.

discarding

B.

listening

C.

learning

D.

forwarding

E.

disabled

 

Correct Answer: AD

Explanation:

There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state.

 

STP (802.1D) Port State

RSTP (802.1w) Port State

Is Port Included in Active Topology?

Is Port Learning MAC Addresses?

Disabled

Discarding

No

No

Blocking

Discarding

No

No

Listening

Discarding

Yes

No

Learning

Learning

Yes

Yes

Forwarding

Forwarding

Yes

Yes

 

Reference: http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml#states

 

 

QUESTION 64

Which three are valid modes for a switch port used as a VLAN trunk? (Choose three.)

 

A.

transparent

B.

auto

C.

on

D.

desirable

E.

blocking

F.

forwarding

 

Correct Answer: BCD

Explanation:

These are the different types of trunk modes:

ON: This mode puts the port into permanent trunk mode and negotiates to convert the link into a trunk link. The port becomes a trunk port even if the adjacent port does not agree to the change.

OFF: This mode puts the port into permanent non-trunk mode and negotiates to convert the link into a non-trunk link. The port becomes a non-trunk port even if the adjacent port does not agree to the change.

Desirable: This mode causes the port to actively attempt to convert the link into a trunk link. The port becomes a trunk port if the adjacent port is set to on, desirable, or auto mode.

Auto: This mode enables the port to convert the link into a trunk link. The port becomes a trunk port if the adjacent port is set to on or desirable mode. This is the default mode for Fast and Gigabit Ethernet ports.

Nonegotiate: This mode puts the port into permanent trunk mode, but does not allow the port to generate Dynamic Trunking Protocol (DTP) frames. The adjacent port must be configured manually as a trunk port to establish a trunk link.

 

 

QUESTION 65

What are three advantages of VLANs? (Choose three.)

 

A.

VLANs establish broadcast domains in switched networks.

B.

VLANs utilize packet filtering to enhance network security.

C.

VLANs provide a method of conserving IP addresses in large networks.

D.

VLANs provide a low-latency internetworking alternative to routed networks.

E.

VLANs allow access to network services based on department, not physical location.

F.

VLANs can greatly simplify adding, moving, or changing hosts on the network.

 

Correct Answer: AEF

Explanation:

VLAN technology is often used in practice, because it can better control layer2 broadcast to improve network security. This makes network more flexible and scalable. Packet filtering is a function of firewall instead of VLAN.

 

 

QUESTION 66

Which switch would STP choose to become the root bridge in the selection process?

 

A.

32768: 11-22-33-44-55-66

B.

32768: 22-33-44-55-66-77

C.

32769: 11-22-33-44-55-65

D.

32769: 22-33-44-55-66-78

 

Correct Answer: A

Explanation:

The root bridge of the spanning tree is the bridge with the smallest (lowest) bridge ID. Each bridge has a configurable priority number and a MAC Address; the bridge ID contains both numbers combined together – Bridge priority + MAC (32768.0200.0000.1111). The Bridge priority default is 32768 and can only be configured in multiples of 4096(Spanning tree uses the 12 bits extended system ID). To compare two bridge IDs, the priority is compared first, as if looking at a real number anything less than 32768…will become the target of being the root. If two bridges have equal priority then the MAC addresses are compared; for example, if switches A (MAC=0200.0000.1111) and B (MAC=0200.0000.2222) both have a priority of 32768 then switch A will be selected as the root bridge. In this case, 32768: 11-22-33-44-55-66 would be the bridge because it has a lower priority and MAC address.

 

 

QUESTION 67

Which three of these statements regarding 802.1Q trunking are correct? (Choose three.)

 

A.

802.1Q native VLAN frames are untagged by default.

B.

802.1Q trunking ports can also be secure ports.

C.

802.1Q trunks can use 10 Mb/s Ethernet interfaces.

D.

802.1Q trunks require full-duplex, point-to-point connectivity.

E.

802.1Q trunks should have native VLANs that are the same at both ends.

 

Correct Answer: ACE

Explanation:

By default, 802.1Q trunk defined Native VLAN in order to forward unmarked frame. Switches can forward Layer 2 frame from Native VLAN on unmarked trunks port. Receiver switches will transmit all unmarked packets to Native VLAN. Native VLAN is the default VLAN configuration of port. Note for the 802.1Q trunk ports between two devices, the same Native VLAN configuration is required on both sides of the link. If the Native VLAN in 802.1Q trunk ports on same trunk link is properly configured, it could lead to layer 2 loops. The 802.1Q trunk link transmits VLAN information through Ethernet.

 

 

QUESTION 68

Refer to the exhibit. Which switch provides the span
ning-tree designated port role for the network segment that services the printers?

 

clip_image004

 

A.

Switch1

B.

Switch2

C.

Switch3

D.

Switch4

 

Correct Answer: C

Explanation:

Printers are connected by hubs. Decide the switch that provides the spanning-tree designated port role between Switch3 and Switch4. They have the same priority 32768. Compare their MAC addresses. Switch3 with a smaller MAC address will provide a designated port for printers.

 

 

QUESTION 69

Refer to the exhibit. Which two statements are true of the interfaces on Switch1? (Choose two.)

 

clip_image006

 

A.

Multiple devices are connected directly to FastEthernet0/1.

B.

A hub is connected directly to FastEthernet0/5.

C.

FastEthernet0/1 is connected to a host with multiple network interface cards.

D.

FastEthernet0/5 has statically assigned MAC addresses.

E.

FastEthernet0/1 is configured as a trunk link.

F.

Interface FastEthernet0/2 has been disabled.

 

Correct Answer: BE

Explanation:

Carefully observe the information given after command show. Fa0/1 is connected to Switch2, seven MAC addresses correspond to Fa0/1, and these MAC are in different VLAN. From this we know that Fa0/1 is the trunk interface. From the information given by show cdp neighbors we find that there is no Fa0/5 in CDP neighbor. However, F0/5 corresponds to two MAC addresses in the same VLAN. Thus we know that Fa0/5 is connected to a Hub.

Based on the output shown, there are multiple MAC addresses from different VLANs attached to the FastEthernet 0/1 interface. Only trunks are able to pass information from devices in multiple VLANs.

 

 

 

 

 

QUESTION 70

Refer to the exhibit. A frame on VLAN 1 on switch S1 is sent to switch S2 where the frame is received on VLAN 2. What causes this behavior?

 

clip_image008

 

A.

trunk mode mismatches

B.

allowing only VLAN 2 on the destination

C.

native VLAN mismatches

D.

VLANs that do not correspond to a unique IP subnet

 

Correct Answer: C

Explanation:

Untagged frames are encapsulated with the native VLAN. In this case, the native VLANs are different so although S1 will tag it as VLAN 1 it will be received by S2.

 

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