Cisco Quiz # 3

The process of HTTP asking TCP to send some data and making sure that it is received correctly is an example of what?

• Same-layer interaction

• Adjacent-layer interaction

• OSI model

• All of these answers are correct

Which of the following is true about Ethernet crossover cables for Fast Ethernet?

• Pins 1 and 2 are reversed on the other end of the cable

• Pins 1 and 2 on one end of the cable connect to pins 3 and 6 on the other end of the cable

• Pins 1 and 2 on one end of the cable connect to pins 3 and 4 on the other end of the cable

• The cable can be up to 1000 meters long to cross over between buildings

Imagine a network with two routers that are connected with a point-to-point HDLC serial link. Each router has an Ethernet, with PC1 sharing the Ethernet with Router 1 and PC2 sharing the Ethernet with Router2. When PC1 sends data to PC2, which of the following are true?

• Router1 strips the Ethernet header and trailer off the frame received from PC1, never to be used again

• Router1 encapsulates the Ethernet frame inside an HDLC header and sends the frame to Router2, which extracts the Ethernet frame from forwarding to PC2

• Router1 strips the Ethernet header and trailer off the frame received from PC1, which is exactly re-created by Router2 before forwarding data to PC2

• Router 1 removes the Ethernet IP, and TCP headers and rebuilds the appropriate headers before forwarding the packet to Router2

Which of the following is a difference between Telnet and SSH as supported by a Cisco switch?

• SSH encrypts the passwords used at login, but not other traffic; Telnet encrypts nothing

• SSH encrypts all data exchange, including login passwords; Telnet encrypts nothing

• Telnet is used from Microsoft operation systems, and SSH is used from UNIX and Linus operation systems

• Telnet encrypts only password exchanges; SSH encrypts all data exchanges

Which of the following statements best describes what a switch does with a frame destined from an unknown unicast address?

• It forwards out all interfaces in the same VLAN except for the incoming interface

• It forwards the frame out the one interface identified by the matching entry in the MAC address table

• It compares the destination IP address to the destination MAC address

• It compares the frame’s incoming interface to the source MAC entry in the MAC address table

An engineer had formerly configured a Cisco 2960 switch to allow Telnet access so that the switch expected a password of 'mypassword' from the Telnet user. The engineer then changed the configuration to support Secure Shell. Which of the following commands could have been part of the new configurations? (Choose two answers)

• A username name secret password vty mode subcommand

• A username name secret password global configuration command

• A login local vty mode subcommand

• A transport input ssh global configuration command

A Cisco Catalyst switch connect with its Gigabit0/1 port to an end user's PC. The end user, thinking the user is helping, manually sets the PC’s OS to use a speed of 1000 Mbps and to use full duplex, and disables the use of autonegotiation. The switch’s Go1/1 port has default settings for speed and duplex. What speed and duplex settings will the switch decide to use? (Choose two answers)

• Full duplex

• Half duplex

• 10 Mbps

• 100 Mbps

Switch SW1 sends a frame to switch SW2 using 802.1Q trunking. Which of the answers describes how SW1 changes or adds to the Ethernet frame before forwarding the frame to SW2?

• Inserts a 4-byte header and does changed the MAC address

• Inserts a 4-byte header and does not change the MAC address

• Encapsulates the original frame behind an entirely new Ethernet header

• None of the other answers are correct

Which of the following facts determines how often a non-root bridge or switch sends an STP Hello BPDU message?

• The Hello timer as configured on that switch

• The Hello timer as configured on the root switch

• It is always every 2 seconds

• The switch reacts to BPDUs received from the root switch by sending another BPDU 2 seconds after receiving the root BPDU

With the Cisco RPVST+, which of the following action(s) does a switch take to identify which VLAN is described by a PPDU? (Choose three answers)

• Adds a VLAN tag when forwarding a BPDU on trunks

• Adds the VLAN ID in an extra TLV in the BPDU

• Lists the VLAN ID as the middle 12 bits of the System ID field of the BPDU

• List the VLAN ID in the System ID extension field of the BPDU