готовка к циско с 56 задания

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

• • The SSH client on the switch is enabled.

• • The switch requires a username/password combination for remote access.

• • The switch requires remote connections via a proprietary client software.

• Communicetion between the switch and remote users is encrypted.

poor handling of key electrical components lack of critical space parts, poor, cabling, and poor labeling

• maintenance threats

• envaironmental threats

• electrical thearts

• hardware thearts

temperature extreames (to hot or too cold) or humidity extreames (too wet or too dry)

• envaironmental threats

• hardware threats

• electrical threarts

• maintenance threarts

physical damage to servers, routers, switches, cabling plant, and workstations

• hardware threats

• envaironmental threats

• maintenance threats

• electrical threats

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?

• DDos

• access

• reconnaissance

• Trojan Horse

Answer explanation

Explanation: A reconnaissance attack is the unauthorized discovery and documentation of various computing networks, network systems, resources, applications, services, or vulnerabilities.

What service is provided by HTTP?

• • Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.

• • Allows for data transfers between a client and a file server.

• • An application that allows real-time chatting among remote users.

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

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

• FTP

• DHCP

• Telnet

• SSH

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

• • Switches become overloaded because they concentrate all the traffic from the attached subnets.

• • The network may become overloaded because ARP reply messages have a very large payload due to the 48-bit MAC address and 32-bit IP address that they contain.

• • A large number of ARP request and reply messages may slow down the switching process, leading the switch to make many changes in its MAC table.

• 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.

Answer explanation

Explanation: ARP requests are sent as broadcasts:
(1) All nodes will receive them, and they will be processed by software, interrupting the CPU.
(2) The switch forwards (floods) Layer 2 broadcasts to all ports.

A switch does not change its MAC table based on ARP request or reply messages. The switch populates the MAC table using the source MAC address of all frames. The ARP payload is very small and does not overload the switch.

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? (Choose three.)

• • netsh interface ipv6 show neighbor

• • arp -a

• • ping

• ipconfig

• nslookup

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?

• • analyze the destination IP address

• • look up the next-hop address for the packet

• • discard the traffic after consulting the route table

• switch the packet to the directly connected interface

Answer explanation

Explanation: A router receives a packet on an interface and looks at the destination IP address. It consults its routing table and matches the destination IP address to a routing table entry. The router then discovers that it has to send the packet to the next-hop address or out to a directly connected interface. When the destination address is on a directly connected interface, the packet is switched over to that interface.