Test your basic knowledge |

Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Enables error-disable for conditions that trigger port security configured on a port
Switch(config)#errdisable detect cause psecure-violation
FIB with adjacency table
10 km
A switch port that has been shut down automatically due to a serious error condition

2. What is LAN PHY used for?
1 -2 on one end with 3 -6 on the other end
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause gbic-invalid
Interconnecting switches in a campus network

3. What is 1000BASE-LX/LH?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
SVI or native routed interface
Routing table and ARP table

4. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Dynamic
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch#show cef drop

5. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Ternary Content-Addressable Memory
The Null adjacency
IEEE 802.3

6. Adds a description to an interface configuration
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Electromagnetic Interference
Switch(config-if)#description {string}

7. Displays the contents of the CAM table
Switch#show errdisable detect
IEEE 802.3z
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
S = Short; L = Long; E = Extra-long

8. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Tunnel
IEEE 802.3u

9. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
The Layer 3 engine
100 metres
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

10. What is 100BASE-T4?
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

11. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Routing table and ARP table
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Static access or dynamic

12. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
Switch#show interfaces {interface}
The Layer 3 engine
Enable error-disable for all possible causes

13. What connectors can be used with SFP modules?
LC - MT-RJ or RJ-45
Static access or dynamic
Tunnel
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

14. What is the TCAM Value and Mask for an IGMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switched virtual interface (SVI)
Switch(config)#errdisable detect cause arp-inspection
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

15. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Half duplex
SVI
Switch(config)#interface range macro {name}
40 km

16. What is the administrative mode of a switch port that is a member of one VLAN?
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause unicast-flood
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Static access or dynamic

17. What are the duplex modes of a GigaStack GBIC?
Compiling Access Control Entries (ACE) into the TCAM table
Enable error-disable for all possible causes
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
On

18. What is the maximum cabling distance for 1000BASE-LX/LH?
1000BASE-T full duplex followed by 1000BASE-T half duplex
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

19. What is the name of the CEF engine that forwards packets in hardware?
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
The Layer 3 forwarding engine
Configure the appropriate values manually on both ends of the link
Half duplex

20. What is unknown unicast flooding?
On
Switch(config)#errdisable detect cause l2ptguard
400 metres half duplex and 2000 metres full duplex
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

21. How do Layer 2 switches provide isolation between hosts?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Static access or dynamic
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

22. What is the prerequesite for creating a working SVI?
Electromagnetic Interference
Creating the VLAN
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

23. What is full duplex operation?
Switch(config-if)#no switchport
The Layer 3 forwarding engine
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

24. Enables error-disable for errors related to 802.1x security
Process the first packet in a traffic flow to determine the destination
Switch(config)#errdisable detect cause security-violation
IEEE 802.3ab
The adjacency table

25. What is IEEE?
300 seconds
Off
Institute of Electrical and Electronics Engineers
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)

26. What is the default duplex mode of a Gigabit Ethernet interface?
Off
Cabling specifications for 10 Gigabit Ethernet
Carrier Sense Multiple Access Collision Detection
Full duplex

27. What is the content of TCAM Mask entries?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

28. What is an interface-range macro?
Off
A name assigned to a ranges of interfaces
Switch(config)#errdisable detect cause dhcp-rate-limit
Institute of Electrical and Electronics Engineers

29. What is 10GBASE-SR/SW?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause psecure-violation
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

30. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Enable error-disable for all possible causes
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
S = Short; L = Long; E = Extra-long
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

31. What is FIB?
Half duplex
Forwarding Information Base
Compiling Access Control Entries (ACE) into the TCAM table
400 metres half duplex and 2000 metres full duplex

32. Removes entries from the CAM table
Switch(config)#errdisable detect cause pagp-flap
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

33. What is CSMA/CD?
Switch(config)#errdisable detect cause vmps
Full duplex
Carrier Sense Multiple Access Collision Detection
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

34. What is the maximum cabling distance for 1000BASE-CX?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
25 metres

35. What is 100BASE-T2?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause {all | {cause-name}}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

36. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Switch(config)#errdisable detect cause pagp-flap
Only temporarily for debugging purposes
SVI

37. What is the name of the CEF engine that maintains routing information in software?
Interconnecting switches in a campus network
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch#show running-config interface {interface}
The Layer 3 engine

38. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Static access or trunk
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Content-Addressable Memory
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache

39. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause link-flap
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
XENPAK - X2 - or SFP+

40. When do collisions occur?
When one station transmits at the same time as another on a shared medium
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding

41. What is 1000BASE-CX?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Trunk or dynamic
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#interface vlan {vlan-id}

42. What denotes the number of times a CEF entry has been updated since the CEF table was created?
The CEF entry version number
Switch(config)#errdisable detect cause loopback
Down - static access - trunk or tunnel
The table of learned MAC addresses - ports - and VLAN information

43. What packets are immediately sent to the CEF Layer 3 engine for further processing?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

44. Configures the maximum ageing time for entries in the MAC address table
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#mac address-table aging-time {seconds}

45. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Accelerated CEF (aCEF)
400 metres half duplex and 2000 metres full duplex
1 -2 on one end with 3 -6 on the other end
Ternary Content-Addressable Memory

46. Displays CEF Drop statistics with number of packets and reason for each line card
UTP Fast Ethernet and Gigabit Ethernet
Switch#show cef drop
SVI
Manually by administratively disabling and re-enabling the port

47. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
LOU registers
Packets that have been truncated before they were fully received
Static access - trunk - tunnel or dynamic

48. What combinations are TCAM entries composed of?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Value - Mask - and Result (VMR)
Switch#show interfaces status err-disabled

49. What is the role of a Route Processor (RP) in first generation MLS?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#interface {type}{module}/{number}
Process the first packet in a traffic flow to determine the destination

50. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Switch(config-if)#switchport access vlan {vlan}
Accelerated CEF (aCEF)
Static access or dynamic