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. What is 10GBASE-CX4?
The Drop adjacency
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Configure the appropriate values manually on both ends of the link
Static access

2. What is the maximum cabling distance for 10GBASE-LX4/LW4?
The Layer 3 engine
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
300 seconds
Packets that have been truncated before they were fully received

3. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
LC - MT-RJ or RJ-45
Tunnel
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

4. Enables error-disable for when the port link state is flapping between the up and down states
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
Switch(config)#errdisable detect cause link-flap
Switch(config)#interface vlan {vlan-id}
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

5. What tables are maintained by the CEF Layer 3 forwarding engine?
300 seconds
Trunk
FIB with adjacency table
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

6. Configures the maximum ageing time for entries in the MAC address table
Switch#show interfaces status err-disabled
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#mac address-table aging-time {seconds}
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

7. What is the maximum cabling distance for 1000BASE-ZX?
70 km for 9 micron SMF; 100 km for 8 micron SMF
A station must wait its turn to transmit; it can't transmit and receive at the same time
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

8. What is TCAM overflow?
Switch#show interfaces status
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
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Distributed CEF (dCEF)

9. What is 1000BASE-CX?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
A three-fold combination of 0 - 1 and X (don't care)
Switch(config)#errdisable detect cause loopback
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

10. What are the common cabling specifications for Fast Ethernet?
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
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
They are dropped (ARP throttling)
Static access

11. What is the administrative mode of a switch port that is a member of one VLAN?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Static access or dynamic
When one station transmits at the same time as another on a shared medium
Cabling specifications for 10 Gigabit Ethernet

12. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
Half duplex
10 km
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

13. What is CAM?
Content-Addressable Memory
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
Switch(config-if)#shutdown
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

14. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Manually by administratively disabling and re-enabling the port
From 30 seconds to 86 -400 seconds (24 hours)
The adjacency table
70 km for 9 micron SMF; 100 km for 8 micron SMF

15. What is the TCAM Value and Mask for an IP access list?
Multilayer Switching
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch#show errdisable recovery
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

16. Displays CEF adjacency table information
Switch#show adjacency [{interface}] [summary | detail]
A station must wait its turn to transmit; it can't transmit and receive at the same time
In TCAM Value entries
Institute of Electrical and Electronics Engineers

17. What function is performed by the Feature Manager (FM)?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Cabling specifications for Gigabit Ethernet
Value - Mask - and Result (VMR)
Compiling Access Control Entries (ACE) into the TCAM table

18. What tables are maintained by the CEF Layer 3 engine?
Dynamic
Distributed CEF (dCEF)
Routing table and ARP table
Cabling specifications for Gigabit Ethernet

19. What is the original standard for Ethernet (10 Mbps)?
S = Short; L = Long; E = Extra-long
Static access - trunk - tunnel or dynamic
Process the first packet in a traffic flow to determine the destination
IEEE 802.3

20. Enables error-disable for errors with dynamic ARP inspection
Enable error-disable for all possible causes
Native routed interface
Switch(config)#errdisable detect cause arp-inspection
A three-fold combination of 0 - 1 and X (don't care)

21. What is the maximum cabling distance for 10GBASE-SR/SW?
IEEE 802.3u
Switch#show cef not-cef-switched
Routing table and ARP table
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

22. What is the default duplex mode of a Fast Ethernet interface?
Switch(config)#errdisable recovery interval {seconds}
IEEE 802.3u
Cisco Express Forwarding
Half duplex

23. What are the names of CEF optimisation techniques using specialised forwarding hardware?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
10 km
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Ternary Content-Addressable Memory

24. Enables automatic re-enabling of error-disabled ports
Process the first packet in a traffic flow to determine the destination
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
Switch(config)#errdisable recovery cause {all | {cause-name}}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

25. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#description {string}
The Punt adjacency

26. What is the maximum cabling distance for 1000BASE-LX/LH?
SC fibre optic or RJ-45 UTP
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
CEF punt
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

27. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config-if)#switchport access vlan {vlan}
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated

28. What is IEEE?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
SC or MT-RJ
Institute of Electrical and Electronics Engineers
Switch(config)#errdisable detect cause storm-control

29. What is EMI?
Configure the appropriate values manually on both ends of the link
Electromagnetic Interference
The table of learned MAC addresses - ports - and VLAN information
1 -2 on one end with 3 -6 on the other end

30. What is 10GBASE-X?
Feature Manager (FM) and Switching Database Manager (SDM)
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause security-violation
IEEE 802.3ab

31. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
1 -2 on one end with 3 -6 on the other end
Switch(config-if)#no switchport
Switch(config-if)#switchport mode access
The CEF entry version number

32. What is Cisco's old recommendation regarding switch port speed and duplex mode?
IEEE 802.3z
Configure the appropriate values manually on both ends of the link
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#errdisable detect cause security-violation

33. What are GigaStack GBICs used for?
XENPAK - X2 - or SFP+
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

34. What information is stored in CAM?
The table of learned MAC addresses - ports - and VLAN information
Switch#show interfaces status
Half duplex
IEEE 802.3

35. What is the operational mode of a switch port that uses DTP negotiation?
1000BASE-T full duplex followed by 1000BASE-T half duplex
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Static access or trunk

36. What is 1000BASE-SX?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
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

37. What is CEF?
Only temporarily for debugging purposes
Switch(config-if)#no ip route-cache cef
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Cisco Express Forwarding

38. Displays static CAM table entries
Switch(config)#errdisable detect cause storm-control
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
400 metres half duplex and 2000 metres full duplex
In parallel revealing the best (longest) match in a single table lookup

39. Selects a switch port interface and enters interface configuration mode
Switch(config)#interface {type}{module}/{number}
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause gbic-invalid
The CEF epoch number

40. Disables CEF operation globally
The Layer 3 engine
Switch(config)#no ip cef
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause udld

41. Displays interface configuration information
Switch#show running-config interface {interface}
In TCAM Value entries
Switch#show errdisable detect
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

42. What is full duplex operation?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#errdisable detect cause psecure-violation

43. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
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)
Content-Addressable Memory
Tunnel
Carrier Sense Multiple Access Collision Detection

44. What is a ternary combination?

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

45. Disables CEF operation on an interface
From 30 seconds to 86 -400 seconds (24 hours)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#no ip route-cache cef
Trunk

46. Displays a list of all interfaces in an error-disabled state
Switch(config)#errdisable detect cause ilpower
Tunnel
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch#show interfaces status err-disabled

47. What is the standard for 10 Gigabit Ethernet (10GbE)?
LAN PHY and WAN PHY
Route caching and topology based
IEEE 802.3ae
Switch#show interfaces {interface}

48. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Switch#show interfaces {interface} switchport
S = Short; L = Long; E = Extra-long
Switch(config)#mac address-table aging-time {seconds}
By Mask/Value - where each unique mask has eight value patterns associated with it

49. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
10 km
The switch port falls back to default setting of half duplex
1 -2 on one end with 3 -6 on the other end
Switch#show adjacency [{interface}] [summary | detail]

50. What is 10GBASE-LR/LW?
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
Feature Manager (FM) and Switching Database Manager (SDM)
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP