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 CAM?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
The CEF entry version number
100 metres
Content-Addressable Memory

2. What function is performed by the Feature Manager (FM)?
The Layer 3 engine
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config)#no ip cef
Compiling Access Control Entries (ACE) into the TCAM table

3. Enables error-disable for misconfiguration of EtherChannel bundles
Switch(config)#errdisable detect cause dtp-flap
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#errdisable detect cause channel-misconfig
Switch#show cef drop

4. What are the types of layer 3 switched interfaces
Switch(config)#errdisable detect cause gbic-invalid
Forwarding Information Base
25 metres
SVI or native routed interface

5. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch(config)#no ip cef
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#show errdisable recovery
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

6. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
SVI
The CEF entry version number
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Ternary Content-Addressable Memory

7. What are the common PMD types for 10 Gigabit Ethernet?
IEEE 802.3z
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Static access - trunk - tunnel or dynamic

8. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
The Discard adjacency
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Only temporarily for debugging purposes
Tunnel

9. What is the standard for 1000BASE-T?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
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
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
IEEE 802.3ab

10. What is the maximum cabling distance for 10GBASE-ER/EW?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause pagp-flap
40 km
25 metres

11. What CEF adjacency is used to switch packets that can't be forwarded normally?
Trunk or dynamic
Switch(config)#errdisable detect cause dtp-flap
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
The Drop adjacency

12. What is the standard for Fast Ethernet (100 Mbps)?
100 metres
IEEE 802.3u
LOU registers
Switch(config)#interface vlan {vlan-id}

13. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
A station must wait its turn to transmit; it can't transmit and receive at the same time
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Tunnel
Dynamic

14. What is the original standard for Ethernet (10 Mbps)?
They are dropped (ARP throttling)
IEEE 802.3
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch#show interfaces {interface}

15. What are the names of the two basic generations of MLS?
Route caching and topology based
Routing table and ARP table
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
CEF glean

16. What is a GigaStack GBIC?
The adjacency table
Cabling specifications for Gigabit Ethernet
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Content-Addressable Memory

17. What is the name of the CEF engine that maintains routing information in software?
Switch(config)#errdisable detect cause gbic-invalid
Numeric values that represent what action to take after the TCAM lookup occurs
The Layer 3 engine
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

18. What is the name of a Layer 3 physical interface on a switch?
Trunk or dynamic
Full duplex only
Switched virtual interface (SVI)
Native routed interface

19. What are the common cabling specifications for Fast Ethernet?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Only temporarily for debugging purposes
The Drop adjacency
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

20. What is unknown unicast flooding?
IEEE 802.3ae
Slow response times - low throughput - runts and other input errors on the switch ports
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch#show running-config interface {interface}

21. What is the DTP negotiation mode of a switch port configured as trunk?
The Null adjacency
On
Dynamic
Switch#show cef drop

22. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
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 rootguard
S = Short; L = Long; E = Extra-long

23. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
The Discard adjacency
The CEF epoch number
The Layer 3 forwarding engine
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

24. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
Switch(config)#interface range macro {name}
Cabling specifications for Gigabit Ethernet
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 bpduguard

25. What tables are maintained by the CEF Layer 3 engine?
The Layer 3 forwarding engine
Routing table and ARP table
Switch(config-if)#speed {10 | 100 | 1000 | auto}
With a mask value in addition to binary values to decide which keys in a table are relevant

26. What is 10GBASE-LX4/LW4?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
ANSI X3T11 FibreChannel
XENPAK - X2 - or SFP+
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

27. What is 10GBASE-CX4?
1000BASE-T full duplex followed by 1000BASE-T half duplex
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Half duplex
Switch(config)#errdisable detect cause dhcp-rate-limit

28. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3u
10 km
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

29. Displays a list of all interfaces in an error-disabled state
Cabling specifications for 10 Gigabit Ethernet
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
The CEF epoch number
Switch#show interfaces status err-disabled

30. Disables a switch port
The Null adjacency
Switch(config-if)#shutdown
Switch(config-if)#switchport mode access
Collision domain

31. What Ethernet ports allow for autonegotiation?
UTP Fast Ethernet and Gigabit Ethernet
Switch(config)#errdisable detect cause dhcp-rate-limit
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config-if)#speed {10 | 100 | 1000 | auto}

32. What combinations are TCAM entries composed of?
Wide-Wavelength Division Multiplexing
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Value - Mask - and Result (VMR)
10 km

33. Selects an interface-range macro and enters interface configuration mode
Full duplex only
Switch(config)#interface range macro {name}
American National Standards Institute
Enable error-disable for all possible causes

34. Enables error-disable when an interface has been looped back
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#errdisable detect cause loopback
Switch(config-if)#description {string}
Switch#show running-config interface {interface}

35. What is the TCAM Value and Mask for an IGMP access list?
SVI or native routed interface
Institute of Electrical and Electronics Engineers
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

36. What is 10GBASE-ER/EW?
Switch(config)#errdisable detect cause gbic-invalid
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

37. What is the maximum cabling distance for 1000BASE-ZX?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable detect cause loopback
70 km for 9 micron SMF; 100 km for 8 micron SMF
SVI or native routed interface

38. What information is stored in CAM?
1000BASE-T full duplex followed by 1000BASE-T half duplex
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#interface vlan {vlan-id}
Switch(config-if)#no ip route-cache cef

39. Enables error-disable detection
On
Full duplex
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#errdisable detect cause {all | {cause-name}}

40. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause bpduguard
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

41. What is CSMA/CD?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Carrier Sense Multiple Access Collision Detection
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
The switch port falls back to default setting of half duplex

42. What tables are maintained by the CEF Layer 3 forwarding engine?
LC - MT-RJ or RJ-45
FIB with adjacency table
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
Distributed CEF (dCEF)

43. What is TCAM overflow?
Static access or dynamic
Only temporarily for debugging purposes
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

44. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
The CEF epoch number
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config-if)#no switchport

45. What are the Fast Ethernet autonegotiation selection priorities?
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Only temporarily for debugging purposes
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

46. What are the duplex modes of a GigaStack GBIC?
Half duplex
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

47. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
LC - MT-RJ or RJ-45
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch#show errdisable detect
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

48. What connectors can be used with GBIC modules?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable detect cause loopback
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

49. What two IOS software components are involved in TCAM operation?
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Feature Manager (FM) and Switching Database Manager (SDM)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

50. What is the maximum cabling distance for 1000BASE-CX?
Multilayer Switching
SC or MT-RJ
25 metres
A three-fold combination of 0 - 1 and X (don't care)