Question 1

Dave's organization is using a VLAN setup where different departments are connected to different VLANs. Dave is trying to verify if the switch interface 0/3 is assigned to the Engineering VLAN. Which of the following commands should he use?

Accepted Answer

to verify if the switch interface 0/3 is connected to the Engineering VLAN, Dave must use the show vlan status command.
Key Takeaway: VLAN is a logical local area network that extends beyond a single traditional LAN to a group of LAN segments, given specific configurations and a specific set of users. The show vlan command is used to display VLAN information. In case of a trunk port, specify the vlan number to display the status of the specific vlan.

Question 2

What would be the status of the switch port link lights if a new catalyst switch is connected to an existing switch using a crossover cable?

Accepted Answer

The switch port light will be green, indicating normal operation.
Key Takeaway: A switch-to-switch connection using a crossover cable is a normal method of connecting two switches. Hence, the switch port lights will blink green, indicating that a normal connection is made.

Question 3

David is trying to fix a connectivity issue between two routers that are directly connected through the serial line. The serial line is up, but he cannot see any neighbors displayed when he runs the show cdp neighbors command. Which of the following layers could be a part of this problem?

Accepted Answer

If the serial line is up and he cannot see any neighbors when he runs the show cdp command, it means that the problem is with the data link layer.
Key Takeaway: The show cdp neighbors command displays detailed information about neighboring devices discovered using Cisco Discovery Protocol. CDP runs over the data link layer and is used to show information about the interfaces your router uses. Hence, if CDP does not work, it is a problem associated with the data link layer.

Question 4

You have implemented a new Frame Relay network in your organization. However it is not functioning properly, since the inverse ARP is working erroneously. Which of the following commands should you use to provide connectivity?

Accepted Answer

You can use the frame-relay map command to provide connectivity on a Frame Relay network.
Key Takeaway: The frame-relay map command need not be used on point-to-point subinterfaces. This is because the end point of the point-to-point connection automatically resides on the same subnet as the start point. It is also not required to enable or disable Inverse ARP, because there is only a single remote destination on a point-to-point PVC and discovery is not necessary. In a multipoint subinterface, the frame-relay map command can be used to associate the multipoint subinterface with specific DLCIs.

Question 5

Which of the following Frame-Relay encapsulation commands should be used to connect a Cisco router to a non-Cisco router?

Accepted Answer

The R1 (config-if)# Encapsulation frame-relay ietf is used to connect a Cisco router to a non-Cisco router.
Key Takeaway: The R1 (config-if)# Encapsulation frame-relay ietf uses the IETF encapsulation, instead of the default Cisco encapsulation. Additionally, in an actual configuration environment, some of the commands that follow this command specify the LMI used by the router to communicate with the Frame Relay switch.

Question 6

David is a network administrator. He has forgotten the password to one of your routers. After a password recovery procedure, the router returns to its normal operation. What is the value that the config-register set to after the password recovery?

Accepted Answer

The value of the config-register will be set to 0x2102 after the password recovery procedure.
Key Takeaway: Routers use 16-bit software configuration register, which is used to set specific system parameters. The settings for the software configuration register are written into nonvolatile random access memory (NVRAM). The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot field. The order in which the switch/router looks for system bootstrap information depends on the boot field setting in the configuration register.

Question 7

One of the workgroup switches in your organization is configured with all ports assigned to VLAN 3, where all ports are configured as full-duplex Fast Ethernet. What is most likely to happen when switch ports are added to a new VLAN on this switch?

Accepted Answer

Adding switch ports to a new VLAN will create an additional broadcast domain.
Key Takeaway: Controlling broadcast domains throughout the network is important to improve the efficiency of a network. Routers operating at Layer 3 of the OSI model provide broadcast domain segmentation for each interface. Switches can also provide broadcast domain segmentation using a VLAN. VLAN is a group of switch ports within single or multiple switches, which is defined by the switch as a single broadcast domain. It groups devices connected into logical broadcast domains.

Question 8

You are the network administrator at your organization. You need to ensure that a web server in your internal network is accessible from the Internet. Since the network uses private addressing, you have configured IP-to-registered-address mapping using the following command on the router:R1 (config)# ip nat inside source static 192.168.4.2198.18.4.254Many users are complaining that they are not able to access the web server from the internet. You first try to ping from the internet, without much success. You then issue the show IP NAT translations command and obtain a blank output. Which of the following issues related to this NAT configuration could it most likely be?

Accepted Answer

This command displays a blank output because NAT has to be configured on all the interfaces.
Key Takeaway: The show IP NAT translations command displays translations that reside in the NAT translation table. All simple translation entries appear with inside/outside and local/global address information. All the extended entries appear with added protocol and port numbers (or query ID).

Question 9

David is a network administrator in his organization. He has configured OSPF on a router with both physical and logical interfaces. Which of the following factors would determine the router ID?

Accepted Answer

The router ID is determined by the highest IP address of any logical interface.
Key Takeaway: An OSPF process running in Cisco IOS requires a router-wide unique router ID. An IP address of an active interface is commonly used as the OSPF router ID. If the OSPF router ID has not been selected in the first step, IP addresses of all other applicable interfaces are collected. OSPF router IDs of active OSPF processes are removed from the list and the highest IP address is used.

Question 10

Which of the following specifies the correct method to log onto the router locally using a terminal emulation program?

Accepted Answer

To logon to a router using a terminal emulation program, you should connect the PC's COM port to the router's console port using a rollover cable.
Key Takeaway: The most commonly used terminal emulator program is a HyperTerminal that runs in Windows. It offers you a text-based command prompt on a remote device. The device should be either a serial device, like a Cisco router, connected directly to your PC's serial port OR a network device. HyperTerminal can either use the local serial interface for communications on the network. If it uses the network, it used the telnet protocol.

Question 11

Which of the following OSI layers has a header that contains the address of a destination host that is on another network?

Accepted Answer

The network layer has a header that contains the address of a destination host that is on another network.
Key Takeaway: The OSI layer is made of seven distinct layers. The network layer, also known as layer 3, has a header that has a network address, or the address of the destination. The packets are delivered using a combination of network address and datalink address. The layer 2 address represents the address of the next hop device on the way to the sender. This address is changed on each hop.

Question 12

Which of the following are the switch and bridge port characteristics of a layer 2 spanning-tree network in a fully converged condition?

Accepted Answer

In a fully converged condition, all switch and bridge ports will be either in the forwarding or blocking state.
Key Takeaway: The switch listens and learns the state of other devices when it comes up on a network. It learns the MAC addresses of the devices on the LAN and any loops in the network. Once this is done, STP designates ports that will be forwarding to the hosts or blocking certain ports that create a loop in the network. This results in a converged condition.

Question 13

Which of the following values is used to determine the port that becomes the root port on each non-root switch in a spanning-tree topology?

Accepted Answer

Path cost is used to determine the port that becomes the root port on each non-root switch in a spanning-tree topology.
Key Takeaway: By default, the root port is a direct link to the root bridge. In other words, it is the shortest path to the root bridge. In case more than one link connects to the root bridge, then a port cost is determined by checking the bandwidth of each link. The lowest cost port becomes the root port.

Question 14

Two hosts on a LAN have accidentally transmitted at the same time, resulting in a collision. Which of the following specifies the first step that occurs after a collision takes place?

Accepted Answer

If a collision takes place, the first thing that happens is that a jam signal is sent to inform all devices that a collision has occurred.
Key Takeaway: When a host on an Ethernet LAN has information to send, the sending device listens to the Ethernet to make sure it is not busy. When it is not busy, the sender sends the frame and listens to make sure that no collision occurred. Once the senders hear the collision, they each send a jamming signal to ensure that all stations recognize the collision. Once the jamming period is complete, each sender randomizes a timer and waits that long. When each timer expires, the sending device starts sending.

Question 15

John enters the show processes command on a router before entering a debug command. Why would he need to enter the show processes command?

Accepted Answer

The show processes command is run before the debug command to check if the CPU utilization is low enough to handle the effects of a debug command.
Key Takeaway: The show processes command displays information about the active processes. The output of this command displays detailed CPU utilization statistics on the processes. In addition to the show processes command, the show processes memory command can also be used to show the amount of memory used.

Question 16

Which of the following fields of an IP packet fragments datagrams to allow different MTUs in the internet?

Accepted Answer

The Identification field fragments datagrams to allow different MTUs in the Internet.
Key Takeaway: The HLEN field uses 4 bits to specify the number of 32-bit words in the header. Type of Service uses 32 bits and shows how datagrams should be handled. The Total length field uses 32 bits to specify the total length of the header and data. The Identification field uses 4 bits and provides fragmentation of datagrams to allow different MTUs in the internet.

Question 17

Which of the following numbering ranges could be used for an IP access list?

Accepted Answer

An IP access list uses a numbering range of 100 - 199.
Key Takeaway: The Cisco Access Control List is used to filter traffic based on a given filtering criteria, either on a router or on a switch interface. Depending on the access and deny criteria, packets are allowed or blocked on the network. Cisco ACLs are available for several types of routing protocols like IP, IPX, and AppleTalk, etc. AppleTalk access lists use numbers in the 600 - 699 range. IP uses 1 - 99 for standard access lists or 100 -199 for extended access lists. IPX uses 800 - 899 or 900 - 999 for extended access lists. IPX SAP filters use 1000 - 1099.

Question 18

Which of the following specifies the administrative distance for RIP?

Accepted Answer

The administrative distance for a RIP protocol is 120.
Key Takeaway: RIP, or the Routing Information Protocol, is a distance vector routing protocol that uses hop count as its metric. Cisco routers select the best path when there are two or more different routes to the same destination from two different routing protocols using the administrative distance parameter. Administrative distance defines the reliability of a routing protocol. Routing protocol with a lower administrative distance is given a higher priority.

Question 19

Which of the following specifies the interval a router running IGRP waits before sending out its complete routing table to its neighbors?

Accepted Answer

Routers using IGRP send routing updates every 90 seconds.
Key Takeaway: IGRP is a distance-vector routing protocol that uses bandwidth and delay as parameters instead of hop count. It has a maximum hop limit of 100 and can be configured to support a network diameter of 255. IGRP sends routing updates to its neighbors every 90 seconds. This update period of 90 seconds is beneficial compared to a 30 second period for RIP.

Question 20

Which of the following IEEE standards is used for frame tagging?

Accepted Answer

802.1Q defines the IEEE standard used for frame tagging.
Key Takeaway: The 802.1Q standard enables large LANs to be broken into much smaller fragments. The fragmenting of the LAN using this protocol provides a much more secure environment between the segments of the internal network. This standard defines the operation of VLAN bridges that permit the definition, operation, and administration of Virtual LAN topologies within a bridged LAN infrastructure.

Quiz 3: Networking