CISCO Certification Questions

Q:

If one of the host connected to Sw-AC3 wants to send message to ip 190.0.2.5 (or any ip on a different subnet) what will be the destination MAC address ?

Answer

Answer and Explanation:


Because the destination address is on a different subnet from the switch, the packet will be forwarded to its default gateway. To verify the default gateway of this switch, use the show running-config command



From the output above, we can see that its default-gateway is 192.168.1.254. Which can be said to be a layer 3 device (router); in this case, the VLAN-R1 router. You can use the show cdp neighbor detail command verify further.



From the output above, you can confirm that the switch's default gateway is VLAN-R1 router (with the IP address of 192.168.1.254).The interface FastEthernet0/3 shows that the switch is directly connected to VLAN-R1 router through the switchport Fa0/3. To verify the MAC address associated this interface is interface, you use the show mac-address-table command:



Looking closely at the table above, you will discorver that the corresponding MAC address is 000a.b7e9.8360. Although there are some entries on port Fa0/3 with different Vlans ,but they have the same MAC address.


From the output above, you can confirm that the switch's default gateway is VLAN-R1 router (with the IP address of 192.168.1.254).The interface FastEthernet0/3 shows that the switch is directly connected to VLAN-R1 router through the switchport Fa0/3. To verify the MAC address associated this interface is interface, you use the show mac-address-table command
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Q:

What is meant by same layer interaction

A) That a packet is forwarded to a different host that resides in the same layer of the Cisco three layer hierarchical model. B) That an interaction occurs within a single layer of a networking model and that no other layers or devices take any part in the interaction.
C) An interaction that progresses up or down only one level of a networking model. D) That two computers use a protocol defined at the same layer of a networking model to communicate with each other.
 
Answer & Explanation Answer: D) That two computers use a protocol defined at the same layer of a networking model to communicate with each other.

Explanation:
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Q:

Which of the following uses ATM as the Data Link layer protocol that's terminated at what's known as the DSLAM?

A) DSL B) PPPoE
C) Frame Relay D) Dedicated T1
 
Answer & Explanation Answer: A) DSL

Explanation:

ATM is the Data-Link layer protocol that's typically used over the DSL layer1 connection from the CPE and terminated at what's known as the DSLAM - an ATM switch that contains DSL interface cards, or ATU-Cs.

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Q:

If your routing table has a static, a RIP, and an EIGRP route to the same network, which route will be used to route packets by default?

A) Any available route B) RIP route
C) Static route D) EIGRP route
 
Answer & Explanation Answer: C) Static route

Explanation:

Static routes have an administrative distance of 1 by default. Unless you change this, a static route will always be used over any other dynamically learned route. EIGRP has an administrative distance of 90, and RIP has an administrative distance of 120, by default

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Q:

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?

A) Supplied by the CSU/DSU B) By the far end router
C) By the clock rate command D) By the Physical layer bits stream timing
 
Answer & Explanation Answer: A) Supplied by the CSU/DSU

Explanation:

Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your non-production test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.

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Q:

If a hub has three computers connected to it, how many broadcast and collision domains is the hub creating?

A) Three broadcast and one collision B) Three broadcast and three collision
C) one broadcast and three collision D) One broadcast and one collision
 
Answer & Explanation Answer: D) One broadcast and one collision

Explanation:

If a hub has three computers connected to it, one broadcast and one collision domain is created

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Q:

Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable?

A. 10.15.32.17
B. 17.15.66.128
C. 66.55.128.1
D. 135.1.64.34
E. 129.33.192.192
F. 192.168.5.63

Answer

Answer : A C D


 


 


 


Explanation: If you follow the cram table,  /27 is mask 255.255.255.224. 3 bits were borrowed with value of 32. Follow the fourth octets of the addresses:
A is a usable host address.
B is classified as a network address
C is a usable host address form the subnet 0
D is a usable host address
E is a network address
F is a broadcast address

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Q:

A switch has been configured configured for three different VLANs : VLAN2, VLAN3 and VLAN4. A router has been added to provide communication between the VLANs. What minimum type of interface necessary on the router if only one connection is to be made between the router and the switch?

A) 10Mbps Ethernet B) 56Kbps Serial
C) 100Mbps Ethernet D) 1Gbps Ethernet
 
Answer & Explanation Answer: C) 100Mbps Ethernet

Explanation:

Although you can use either 100Mbps or 1Gbps Ethernet, the 100Mbps is necessary at a minimum and is the best answer to this question. You need to trunk the link from the switch to the router to make this connection work with inter-VLAN communication.

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