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Network+ > Network Troubleshooting > Flashcards

Network Troubleshooting Flashcards

1
Q

phenomenon where an electrical signal from one wire bleeds into another wire, creating interference

A

crosstalk

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2
Q

spurious signals caused by faulty hardware or badly crimped jacks

A

noise

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3
Q

cable problem caused by the connection of two cables with difference impedances (natural resistance), resulting in echo

A

impedance mismatch

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4
Q

tool used to see if a cable can handle the rated amount of capacity; checks for crosstalk, attenuation, interference, and even impedance mismatch; used when there is a slowdown, not disconnects; needs some kind of loopback adapter installed at the other end of the cable

A

certifier

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5
Q

tool used to measure the amount of light loss in an fiber cable; a calibrated detector is installed at the other end of the cable

A

light/optical power meter

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6
Q

tool used to tell if there is a power/electrical problem with a cable/device?’ used to check intermittent problems

A

voltage quality recorder

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7
Q

tool used to measure the temperature in a room, like a server room; used to check intermittent problems

A

temperature monitor

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8
Q

utility used to inform one of the IP information/settings for a computer; for Windows, Macos/UNIX, and Linux respectively

A

ipconfig/ifconfig/ip

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9
Q

utility that resolves an IP address to a MAC address; stored on computers and Level 3 devices (routers)

A

Address Resolution Protocol (arp)

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10
Q

utility that uses ARP frames instead of ICMP packets to query a device; can only be used within a broadcast domain - can’t cross routers since it doesn’t use IP packets, only frames; supported by UNIX and UNIX-like systems

A

arping

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11
Q

Microsoft utility that combines the functionality of ping and tracert

A

pathping

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12
Q

utilities used to troubleshoot DNS issues; supported by all OS’s and MacOS/UNIX/Linux respectively

A

nslookup/dig

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13
Q

dynamic equivalent to tracert, not supported by Windows

A

My Traceroute (mtr)

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14
Q

utility used to display a device’s routing table

A

route

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15
Q

utility used to display the state of all running processes; shows which sessions are active and provide statistics based on ports and protocols; without switches, this command only shows current sessions

A

netstat

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16
Q

Linux utility that enables control over IPv4 tables - rules that determine what happens to IPv4 packets on a firewall; replaced by nftables

A

iptables

17
Q

Linux/UNIX command line tool that monitors and filters network packets and it can create files for later viewing in Wireshark

A

tcpdump

18
Q

tool used to measure the flow of data through a network

A

throughput/bandwidth speed tester

19
Q

remote servers accessed via a web browser that provides diagnostic tools like ping and tracert from outside the local network; also provides some BGP query tools

A

looking glass site

20
Q

technology that combines multiple NICs together in order to increase bandwidth in smaller increments (and cheaper) than upgrading NICs to the next standard; can also create redundancy by setting one NIC to primary (live) and the other to hot spare (standby)

A

link aggregation/NIC teaming

21
Q

IEEE 802.3ad protocol for enabling two or more network connections to work together simultaneously; ports can be in active or passive mode and must communicate at the same speeds

A

Ling Aggregation Control Protocol (LACP)

22
Q

Cisco proprietary protocol for combining multiple network connection into one logical connection

A

Port Aggregation Protocol (PAgP)

23
Q

issue where one’s IP packets are so large that they must be fragmented to fit into an ISP’s packets

A

MTU mismatch

24
Q

method for automatically determining the right MTU size; this-aware OS can send ICMP packets with a “Don’t Fragment” flag (DF) to another device until the ping is successful; worthless if firewall is set to block ICMP requests

A

Path MTU Discovery (PMTU)

25
Q

Cisco network appliance, which possibly contains routing, NAT, switching, and IDS features, plus firewall

A

Cisco Adaptive Security Appliance (ASA)

26
Q

problem where the NAT rule order on a “router”/network appliance is incorrect, causing traffic to go out an incorrect interface

A

NAT interference misconfiguration

27
Q

process of making remote computers act as though they are on a local network, such as VPN; almost all such problems occur on the VPN concentrator, which can cause what appears to be a DoS attack

A

proxy ARP

28
Q

principle stating that work should happen only on the endpoints of a network

A

end-to-end principle

Network+ (21 decks)

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