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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 IEEE?
Institute of Electrical and Electronics Engineers
Routing table and ARP table
A three-fold combination of 0 - 1 and X (don't care)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

2. What is the maximum cabling distance for 1000BASE-CX?
The adjacency table
On
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
25 metres

3. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
SC or MT-RJ
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
On
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

4. How does topology based switching work?
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
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#interface vlan {vlan-id}
Switch(config-if)#shutdown

5. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
Switch(config)#errdisable detect cause dtp-flap
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

6. Enables error-disable for errors with offering inline power
Tunnel
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause ilpower
A three-fold combination of 0 - 1 and X (don't care)

7. What connectors can be used with GBIC modules?
10GbE operates only at full duplex
Switch#show interfaces {interface}
R = LAN PHY; W = WAN PHY
SC fibre optic or RJ-45 UTP

8. What is 1000BASE-ZX?
Switch#show running-config interface {interface}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show cef drop
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

9. What is the administrative mode of a switch port that is a member of one VLAN?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
CEF glean
Static access or dynamic
10 km

10. Creates a switched virtual interface (SVI) and enters interface configuration mode
Accelerated CEF (aCEF)
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause storm-control
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

11. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch#show adjacency [{interface}] [summary | detail]
Switch(config)#errdisable detect cause l2ptguard
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
American National Standards Institute

12. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Half duplex
Switch(config)#errdisable detect cause vmps
Configure the appropriate values manually on both ends of the link
15 metres

13. 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)
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch(config)#interface vlan {vlan-id}
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

14. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Switch#show cef not-cef-switched
Switch(config-if)#description {string}
Full duplex only
CEF glean

15. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch(config)#interface {type}{module}/{number}
Off
Process the first packet in a traffic flow to determine the destination
IEEE 802.3ae

16. Displays CEF adjacency table information
Route caching and topology based
Switch#show adjacency [{interface}] [summary | detail]
Forwarding Information Base
In TCAM Value entries

17. What are the operational modes of a Layer 2 switched interface?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Logical Operation Unit
Down - static access - trunk or tunnel
In TCAM Value entries

18. What is a ternary combination?

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19. What Ethernet ports allow for autonegotiation?
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
Switch(config-if)#no switchport
UTP Fast Ethernet and Gigabit Ethernet
Switch(config-if)#speed {10 | 100 | 1000 | auto}

20. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config)#errdisable detect cause link-flap
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
Security and QoS ACLs
R = LAN PHY; W = WAN PHY

21. What are the common cabling specifications for Gigabit Ethernet?
LAN PHY and WAN PHY
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

22. What is 100BASE-T4?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause pagp-flap
Content-Addressable Memory

23. What is the standard for Gigabit Ethernet (1000 Mbps)?
Switch(config)#errdisable detect cause security-violation
American National Standards Institute
IEEE 802.3z
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

24. Enables automatic re-enabling of error-disabled ports
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config)#default interface {interface}
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable recovery cause {all | {cause-name}}

25. How is the TCAM organised?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
By Mask/Value - where each unique mask has eight value patterns associated with it
Native routed interface

26. Adds a static entry to the MAC address table
With a mask value in addition to binary values to decide which keys in a table are relevant
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

27. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
In parallel revealing the best (longest) match in a single table lookup
300 seconds
XENPAK - X2 - or SFP+
By Mask/Value - where each unique mask has eight value patterns associated with it

28. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
Switch#show interfaces status
IEEE 802.3ab
Switch#show interfaces {interface} switchport

29. What is the maximum cabling distance for 1000BASE-ZX?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause unicast-flood
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
70 km for 9 micron SMF; 100 km for 8 micron SMF

30. What is the name of the CEF engine that forwards packets in hardware?
The Layer 3 forwarding engine
From 30 seconds to 86 -400 seconds (24 hours)
Store-and-forward
Partition and tune the TCAM on some Catalyst switches into areas for different functions

31. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
Accelerated CEF (aCEF)
10GbE operates only at full duplex
LC - MT-RJ or RJ-45
Ternary Content-Addressable Memory

32. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

33. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
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
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 link-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

34. How is link speed determined on Fast Ethernet links configured to autonegotiate?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
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 detect cause arp-inspection
ANSI X3T11 FibreChannel

35. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
ANSI X3T11 FibreChannel
A switch port that has been shut down automatically due to a serious error condition
Electromagnetic Interference

36. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
R = LAN PHY; W = WAN PHY
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Full duplex
25 metres

37. What is a SVI?
Routing table and ARP table
The adjacency table
Switched virtual interface (SVI)
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

38. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Configure the appropriate values manually on both ends of the link
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
When one station transmits at the same time as another on a shared medium
The switch port falls back to default setting of half duplex

39. What is an interface-range macro?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#no ip cef
Switch(config)#errdisable detect cause gbic-invalid
A name assigned to a ranges of interfaces

40. What is the TCAM Value and Mask for an IP access list?
Switch#show interfaces {interface}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Accelerated CEF (aCEF)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

41. What is the default age-out time for stale entries in the CAM table?
Static access or trunk
300 seconds
Interconnecting switches in a campus network
100 metres

42. What is TCAM overflow?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
In parallel revealing the best (longest) match in a single table lookup
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 detect cause storm-control

43. What is LAN PHY used for?
When one station transmits at the same time as another on a shared medium
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Interconnecting switches in a campus network
Switch(config-if)#description {string}

44. What are the default error-disable detection causes?
IEEE 802.3ae
Dynamic
Enable error-disable for all possible causes
Compiling Access Control Entries (ACE) into the TCAM table

45. Displays a list of all interfaces in an error-disabled state
Switch#show interfaces status err-disabled
Switch(config-if)#no switchport
Value - Mask - and Result (VMR)
Switch(config)#errdisable detect cause vmps

46. What is the content of TCAM Mask entries?

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47. How do Layer 2 switches provide isolation between hosts?
Off
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause unicast-flood

48. Configures the maximum ageing time for entries in the MAC address table
Switch#show errdisable recovery
Switch(config)#mac address-table aging-time {seconds}
15 metres
Switch#show interfaces {interface}

49. What is FIB?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Forwarding Information Base
Switch(config)#errdisable detect cause unicast-flood
Switched virtual interface (SVI)

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

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