Intro to Networking
An administrator wants to change the name of a brand new switch. Using the hostname command "Switch(config)# hostname HR switch", which prompt will display after the command is issued?
"Switch(config)#"
A particular email site does not appear to be responding on a Windows 7 computer. What command could the technician use to show any cached DNS entries for this webpage?
"ipconfig /displaydns"
When applied to a router, which command would help mitigate brute-force password attacks against the router?
"login block-for 60 attempts 5 within 60"
Which two notations are usable nibble boundaries when subnetting in IPv6?
/64 /68
Which three IP addresses are private?
172.16.4.4 10.1.1.1 192.168.5.5
A company has a network address of 192.168.1.64 with a subnet mask of 255.255.255.192. The company wants to create two subnetworks that would contain 10 hosts and 18 hosts respectively. Which two networks would achieve that?
192.168.1.64/27 192.168.1.96/28
Which subnet would include the address 192.168.1.64 as a usable host address?
255.255.255.192 or /26
A TCP segment from a server has been captured by Wireshark, which is running on a host. What acknowledgement number will the host return for the TCP segment that has been received?
306
Three office workers are using a corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other office workers in branch offices. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types?
Audio conference Web page Financial transactions
What two preconfigured settings that affect security are found on most new wireless routers?
Broadcast SSID Default administrator password
A student is attempting to access an 802.11n wireless network. What method is used to manage contention-based access on this wireless network?
CSMA/CA
A host PC has just booted and is attempting to lease an address through DHCP. Which two messages will the client typically broadcast on the network?
DHCPREQUEST DHCPDISCOVER
A small business user is looking for an ISP connection that provides high speed digital transmission over regular phone lines. What ISP connection type should be used?
DSL
Which field in an IPv4 packet header will typically stay the same during its transmission?
Destination address
What function is provided by TCP?
Detection of missing packets.
What are the three primary functions provided by Layer 2 data encapsulation?
Data link layer addressing Detection of errors through CRC calculations Delimiting groups of bits into frames
What is an important function of the physical layer of the OSI model?
Encodes frames into electrical, optical, or radio wave signals.
What is the correct order for PDU encapsulation?
Frame Header Network Header Transport Header Data Frame Trailer
What is a characteristic of the LLC sublayer?
It places information in the frame that allows multiple Layer 3 protocols to use the same network interface and media.
An administrator uses the Ctrl+Shift+6 key combination on a switch after issuing the ping command. What is the purpose of using these keystrokes?
It will escape the ping.
How does a Layer 3 switch differ from a layer 2 switch?
Layer 2 - MAC addresses Layer 3 - IP addresses
Which address on a PC does not change, even if the PC is moved to a different network?
MAC address
During data communications, a host may need to send a single message to a specific group of destination hosts simultaneously. What type of message is this?
Multicast
Which technology provides a solution to IPv4 address depletion by allowing multiple devices to share one public IP address?
NAT
In which default order will a router search for startup configuration information?
NVRAM TFTP Setup mode
The greatest part of the /8 block IPv4 address bit space consists of what types of addresses?
Private address
During normal operation, from which location do most Cisco switches and routers run the IOS?
RAM
Which two statements correctly describe a router memory type and its contents?
RAM - Volatile, stores the IP routing table ROM - Nonvolatile, contains basic diagnostic software
A host is accessing a Web server on a remote network. Which three functions are performed by intermediary network devices during this conversation?
Regenerating data signals Providing a channel over which messages travel Notifying other devices when errors occur
Which connection provides a secure CLI session with encryption to a Cisco network device?
SSH
A ping to PC3 is issued from PC0, PC1, and PC2 in this exact order. Which MAC addresses will be contained in the S1 MAC address table that is associated with the Fa0/1 port?
The MAC address of the last PC to send the request through that port.
A technician uses the ping 127.0.0.1 command. What is the technician testing?
The TCP/IP stack on a network host.
A network technician is measuring the transfer of bits across the company backbone for a mission critical application. The technician notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput?
The amount of traffic that is currently crossing the network The type of traffic that is crossing the network The latency that is created by the number of network devices that the data is crossing
What is the significance of the asterisk (*) in the show file systems output?
The asterisk designates which file system is the default file system.
What is the auto-MDIX feature on a switch?
The automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection.
After making configuration changes on a Cisco switch, a network administrator issues a copy running-config startup-config command. What is the result of issuing this command?
The current configuration is saved so it will run when the device is restarted.
What will happen if the default gateway address is incorrectly configured on a host?
The host will not be able to access devices outside of the local network.
Which parameter does the router use to choose the path to the destination when there are multiple routes available?
The lower metric value that is associated with the destination network.
What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC table?
The switch forwards the frame to the Layer 3 switch.
What happens when part of a VoIP transmission is not delivered to the destination?
The transmission continues without the missing portion.
What happens when part of an Internet VoIP transmission is not delivered to the destination?
The transmission continues without the missing portion.
A PC is configured to obtain an IP address automatically from network 192.168.2.0/24. The network administrator issues the "arp -a" command and notices an entry of 192.168.2.255 ff-ff-ff-ff-ff-ff. Which statement describes this entry?
This is a static map entry.
What is the purpose of having a converged network?
To allow multiple communication modes to run simultaneously in a single network.
A frame is transmitted from one networking device to another. Why does the receiving device check the FCS field in the frame?
To check the frame for possible transmission errors.
What is the effect of configuring the IPv6 unicast-routing command on a router?
To enable the router as an IPv6 route.
What is the purpose of the network security authorization function?
To keep track of the actions of a user.
What is the purpose of ICMP messages?
To provide feedback of IP packet transmissions.
What is the purpose of the routing process?
To select the paths that are used to direct traffic to destination networks.
What procedure is used to reduce the effect of crosstalk in in copper cables?
Twisting opposing circuit wire pairs together.
On which switch interface would an administrator configure an IP address so that the switch can be managed remotely?
VLAN 1
Which type of wireless security generates dynamic encryption keys each time a client associates with an AP?
WPA
Which two components are necessary for a wireless client to be installed on a WLAN?
Wireless NIC Wireless Client Software
