Course 51-100

Question 1

What are two ICMPv6 messages that are not present in ICMP for IPv4?

Answer 1

Router Advertisement

Network solicitation

Question 2

A client packet is received by a server. The packet has a destination port number of 80. What service is the client requesting?

Answer 2

HTTP

Question 3

What is an advantage for small organizations of adopting IMAP instead of POP?

Answer 3

Messages are kept in the mail servers until they are manually deleted from the email client.

Question 4

A technician can ping the IP address of the web server of a remote company but cannot successfully ping the URL address of the same web server. Which software utility can the technician use to diagnose the problem?

Answer 4

nslookup

Question 5

Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?

Answer 5

enables IPv4 and IPv6 to utilize the same physical medium

places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

adds Ethernet control information to network protocol data

handles communication between upper layer networking software and Ethernet NIC hardware

Question 6

The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?

Answer 6

The switch can be remotely managed from a host on another network.

Question 7

What happens when the transport input ssh command is entered on the switch vty lines?

Answer 7

Communication between the switch and remote users is encrypted.

Question 8

A disgruntled employee is using some free wireless networking tools to determine information about the enterprise wireless networks. This person is planning on using this information to hack the wireless network. What type of attack is this?

Answer 8

reconnaissance

Question 9

What service is provided by HTTP?

Answer 9

A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.

Question 10

A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?

Answer 10

DHCP

Question 11

What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)

Answer 11

The ARP request is sent as a broadcast, and will FLOOD the entire subnet.

All ARP request messages must be processed by all nodes on the local network.

Question 12

A group of Windows PCs in a new subnet has been added to an Ethernet network. When testing the connectivity, a technician finds that these PCs can access local network resources but not the Internet resources. To troubleshoot the problem, the technician wants to initially confirm the IP address and DNS configurations on the PCs, and also verify connectivity to the local router. Which three Windows CLI commands and utilities will provide the necessary information?

Answer 12

ipconfig
nslookup
ping

Question 13

During the process of forwarding traffic, what will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?

Answer 13

switch the packet to the directly connected interface

Question 14

What characteristic describes antispyware

Answer 14

applications that protect end devices from becoming infected with malicious software

Question 15

A network administrator needs to keep the user ID, password, and session contents private when establishing remote CLI connectivity with a switch to manage it. Which access method should be chosen?

Answer 15

SSH

Question 16

What are the two most effective ways to defend against malware?

Answer 16

Update the operating system and other application software.

Install and update antivirus software.

Question 17

Which type of security threat would be responsible if a spreadsheet add-on disables the local software firewall?

Answer 17

Trojan horse

Question 18

Which FRAME field is created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss?

Answer 18

FRAME check sequence field

Question 19

A network administrator is adding a new LAN to a branch office. The new LAN must support 4 connected devices. What is the smallest network mask that the network administrator can use for the new network?

Answer 19

255.255.255.248

Question 20

What service is provided by POP3?

Answer 20

Retrieves email from the server by downloading the email to the local mail application of the client.

Question 21

What two security solutions are most likely to be used only in a corporate environment?

Answer 21

VPN
IPS

Question 22

What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network?

Answer 22

It DECREMENTS the value of the TTL field by 1 and if the result is 0, it discards the packet and sends a Time Exceeded message to the source host.

Question 23

A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?

Answer 23

TFTP

Question 24

An administrator defined a local user account with a secret password on router R1 for use with SSH. Which three additional steps are required to configure R1 to accept only encrypted SSH connections?

Answer 24

Configure the IP domain name on the router.
Generate the SSH keys.
Enable inbound vty SSH sessions.

Question 25

Which two functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

Answer 25

implements trailer with frame check sequence for error detection implements a process to delimit fields within an Ethernet 2 frame