Networking Basics Questions and Answers

Answer: B

Correct answer: copy running-config startup-config

The running configuration lives in RAM and is lost at reload; the startup configuration lives in NVRAM and is what the router reads on boot. Copying one to the other saves the current settings, and the abbreviation copy run start is the form most often typed. The older write memory did the same job on earlier IOS versions and survives as a deprecated alias, but the copy form is the current command.

Answer: D

Explanation: In a computer network, a node can be anything that is capable of sending data or receiving data or even routing the data to its destination. Routers, Computers and Smartphones are some examples of network nodes.

Answer: B

Correct answer: Physical layer

A hub simply regenerates and repeats the electrical signal out of every other port. It reads no addresses, makes no forwarding decisions and does not examine frames at all, so it belongs to the physical layer - it is a multiport repeater. A switch, which reads MAC addresses and forwards selectively, is a data link layer device, and a router, which reads IP addresses, is a network layer device.

Answer: D

Correct answer: copy flash tftp

The IOS image lives in flash, and a backup copies it from there to a TFTP server, so the source comes first and the destination second: copy flash tftp. Reversing it, copy tftp flash, is the command for an upgrade, which writes a new image into flash from the server. Reading the two words in order is the whole of the distinction, and it is the same convention as copy running-config startup-config.

Answer: A

Correct answer: personal area network

A PAN covers the space immediately around a person, typically within about ten metres, and Bluetooth is its most familiar technology - connecting a headset, keyboard or fitness tracker to a phone or computer. A LAN spans a building or campus, a WAN a country or the world, and a VPN is a logical network tunnelled over a public one rather than a matter of physical range.

Answer: A

Explanation: Network congestion occurs when traffic in the network is more than the network could handle. To avoid network congestion, the network management uses various open-loop and closed-loop congestion control techniques.

Answer: B

Correct answer: show access-lists

show access-lists displays every access list configured on the router, of all protocols, with each statement and the number of packets it has matched - those counters being invaluable when diagnosing a list that is not behaving as intended. show ip interface reveals where a list is applied but not what is in it, and the interface commands show neither.

Answer: D

Correct answer: A network that has only one entry and exit point.

A stub network reaches the rest of the internetwork through a single point, so there is only one possible path in or out. Because no routing decision is available, it needs no dynamic routing protocol - a default route out of it and a static route into it are sufficient, which is why stubs are used to reduce routing overhead. A network with no exit at all would be isolated rather than a stub.

Answer: C

Correct answer: FCC

The Federal Communications Commission regulates interstate and international communications by radio, television, wire, satellite and cable, and it allocates the radio spectrum within the United States. The ITU-T issues international telecommunication recommendations but does not regulate commerce; the IEEE develops standards such as the 802 series; and ISOC is the parent body of the IETF.

Answer: C

Correct answer: ICMP

Ping sends an ICMP echo request and waits for an echo reply, timing the round trip. It carries no transport layer header at all, which is why a ping can succeed while an application still fails - reachability at the network layer says nothing about whether a TCP port is open. ARP resolves addresses within a segment, and BootP is a predecessor of DHCP.