Question 1

Which of the following commands is used to setup a trunk port on a 2960 switch?

Accepted Answer

You can use the switchport mode trunk command to setup a trunk port on a 2960 switch.
Key Takeaway: Setting up a switch port to trunk mode allows all VLAN information to pass down the link. Every port on a Cisco switch is either an access port or a trunk port. Access ports belong to a single VLAN and do not provide identification on the frames that are passed between switches. They also carry traffic that comes from only the VLAN assigned to the port. A trunk port is, by default, a member of all the VLANs that exist on the switch and carries traffic for all those VLANs between the switches.

Question 2

Dave is trying to disable STP on a port connected to a server. Which command should he use?

Accepted Answer

To disable STP on a port connected to the server, Dave must use the spanning-tree portfast command.
Key Takeaway: Spanning-tree portfast causes a port to enter the spanning-tree forwarding state immediately, bypassing the listening and learning states. Portfast can be used on switch ports connected to a single workstation or server. This allows the devices to connect to the network immediately, instead of waiting for the port to transition from the listening and learning states to the forwarding state. Portfast should be used only when connecting a single end station to a switch port.

Question 3

Which of the following commands will display the forward/filter table in a switch?

Accepted Answer

The command that displays the forward/filter table on the switch is the show mac address-table.
Key Takeaway: This command is used to display information about the MAC address table on a switch. Some of the switches that can be used with this command are interface-number, vlan vlan-id, dynamic, and igmp-snooping.

Question 4

David is working as a network administrator at his organization. His network is using EIGRP. He wants to check the IP addresses of the adjacent neighbors, and verify the EIGRP retransmit intervals and queue counts. Which of the following commands should he use?

Accepted Answer

To check the IP addresses of the adjacent neighbors and verify the EIGRP retransmit intervals and queue counts, David should use the R1#show ip eigrp neighbors command.
Key Takeaway: This command is used to display the neighbors discovered by Enhanced Interior Gateway Routing Protocol. It is used in the EXEC mode. It is primarily used to determine when neighbors become active and inactive. Additionally, it is also useful for debugging certain types of transport problems.

Question 5

Which of the following commands will display all the EIGRP feasible successor routes known to a router?

Accepted Answer

The AP1# show ip eigrp topology command will display all the EIGRP feasible successor routes known to a router.
Key Takeaway: The "show ip eigrp topology" command is used to display the entries in the EIGRP topology table. The topology table contains the feasible successors for each route. The parameters on the table include feasible distance, each feasible successor's advertised distance to the route, and the locally calculated distance and cost to the destination.

Question 6

David needs to implement a routing protocol that meets the following requirements: quick convergence, support VLSM, CIDR, IP, IPX, and minimal usage of bandwidth for routing updates. Which of the following protocols should he use?

Accepted Answer

To fulfill all of the requirements, David should use EIGRP.
Key Takeaway: EIGRP, or the Enhanced Interior Gateway Routing Protocol, is a hybrid routing protocol that uses a distributed update algorithm. It combines the Link-state and Distance-Vector algorithms. Unlike IGRP, which only understands major network numbers, EIGRP can be configured to use subnet masks and supernet masks. The advantages of EIGRP are fast convergence, support for multiple protocols, and less bandwidth requirements than Distance-vector protocols. This is because only partial updates are broadcast-only when changes in topology are detected- not periodic broadcasts.

Question 7

Which of the following commands will configure a default route on a router?

Accepted Answer

The router (config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1 will configure a default route on a router.
Key Takeaway: A default route is the network route used by a router when no other known route exists for a given IP packet's destination address. All the packets for destinations not known by the router's routing table are sent to the default route. To configure a default route to be an IP address x, the configuration should be IP route 0.0.0.0 0.0.0.0 x.

Question 8

Which of the following is one of two devices that can complete a connection between the WAN router at the customer site and the service provider?

Accepted Answer

CSU/DSU is used to complete the connection between a WAN router at the customer site and the service provider.
Key Takeaway: CSU/DSU, or a Channel Service Unit/Data Service Unit, is a digital-interface device used to connect a Data Terminal Equipment device or DTE, such as a router, to a digital circuit. It operates at the physical layer of the OSI model. CSU provides termination for the digital signal and ensures connection integrity through error correction and line monitoring. DSU converts the data encoded in the digital circuit into synchronous serial data for connection to a DTE device and provides timing to each end.

Question 9

Which of the following routing protocols is less prone to routing loops and network reachability issues when used in discontiguous networks?

Accepted Answer

OSPF is less prone to routing loops and network reachability issues when used in discontiguous networks.
Key Takeaway: OSPF is the best protocol for discontiguous networks because each area in an OSPF has a collection of networks and OSPF attaches a mask to each advertisement. Hence, it is less prone to routing loops and network reachability issues.

Question 10

David needs to configure the default gateway of one of his switches. Which of the following commands will set the default gateway to 192.168.6.4 on a Cisco switch?

Accepted Answer

To configure the default gateway as 192.168.6.4 on a Cisco switch, David should use the S(config)# ip default-gateway 192.168.6.4.
Key Takeaway: The set of commands to configure the default gateway on a switch include:
Switch#
Switch#conf t
Switch(config)#ip default-gateway {ip address}.

Question 11

What of the following specifies the options provided by ISL and 802.1q frame tagging in a switched LAN environment?

Accepted Answer

ISL and 802.1q provide inter-switch VLAN communication in a switched LAN environment.
Key Takeaway: Inter-switch Link, or ISL, is a Cisco Systems proprietary protocol that maintains VLAN information for traffic flow between network devices. It is Cisco's VLAN encapsulation method and is supported only on Cisco's equipment. 802.1Q, also known as VLAN Tagging, is a networking standard that allows multiple bridged networks to transparently share the same physical network link without leakage of information between networks. It is commonly used to refer to the encapsulation protocol.

Question 12

Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?

Accepted Answer

The Transport Layer is responsible for ensuring the end-to-end delivery of data.
Key Takeaway: The Transport Layer is Layer 4 of the OSI model. It is responsible for delivering data to the appropriate application process on the host computer. This process involves statistical multiplexing of data from different application processes by forming data packets and adding source and destination port numbers in the header of each Transport Layer data packet.

Question 13

Which of the following fields of the IP datagram identifies the message to which a datagram belongs to ( It also enables the receiving node to reassemble fragmented messages)?

Accepted Answer

The identification field contains a 16-bit value that is common to each of the fragments belonging to a particular message.
Key Takeaway: This field specifies a number allocated to each fragment in order to enable reassembling of datagrams at the receiving end. Internet Header Length (IHL) specifies the length of the IP header in 32-bit words. Fragment Offset specifies the offset-or position-in the overall message where the data in this fragment goes. The Flags field is used to manage fragmentation.

Question 14

Routing tables contain a metric field that indicate the cost of a particular route. Which of the following could be possible parameters expressed in this field?

Accepted Answer

The number of hops is the parameter that determines the cost of the route. IP address, MAC address, and subnet mask do not determine the cost of any route.
Key Takeaway: A cost of a route is obtained using an algorithm. This algorithm may use metrics like weight, local preference, aggregate, AS-path length, origin type, origin, and number of hops to calculate the cost of a route. Number of hops is the most primitive metric used by the RIP protocol.

Quiz 3: Networking