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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 CSMA/CD?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Carrier Sense Multiple Access Collision Detection

2. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config)#errdisable detect cause pagp-flap
300 seconds

3. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
Switch(config-if)#no switchport
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)
Full duplex only

4. Displays CEF adjacency table information
Switch#show adjacency [{interface}] [summary | detail]
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch#show interfaces status err-disabled
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

5. What are the operational modes of a Layer 2 switched interface?
Slow response times - low throughput - runts and other input errors on the switch ports
SVI or native routed interface
Down - static access - trunk or tunnel
Switch#show cef drop

6. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
10GbE operates only at full duplex
Tunnel
Trunk or dynamic
Switch(config)#errdisable detect cause storm-control

7. What is 1000BASE-ZX?
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
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show interfaces {interface} switchport
Source MAC address; Port of arrival; VLAN; Time stamp

8. What is 10GBASE-SR/SW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
10 km
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Static access

9. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Tunnel
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
Feature Manager (FM) and Switching Database Manager (SDM)

10. What is an interface-range macro?
Switch#show interfaces status
A name assigned to a ranges of interfaces
Switch#show interfaces status err-disabled
15 metres

11. What is the default duplex mode of a Fast Ethernet interface?
Electromagnetic Interference
Half duplex
Distributed CEF (dCEF)
In parallel revealing the best (longest) match in a single table lookup

12. What is a GigaStack GBIC?
Wide-Wavelength Division Multiplexing
Switch(config-if)#switchport mode access
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Collision domain

13. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
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
Switch#show ip cef
Static access

14. What is the default duplex mode of a Gigabit Ethernet interface?
IEEE 802.3
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
LOU registers
Full duplex

15. What is TCAM overflow?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#mac address-table aging-time {seconds}
Half duplex

16. What tables are maintained by the CEF Layer 3 engine?
Switch(config)#default interface {interface}
Dynamic
Routing table and ARP table
Partition and tune the TCAM on some Catalyst switches into areas for different functions

17. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Switch(config)#errdisable detect cause loopback
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Dynamic
1 -2 on one end with 3 -6 on the other end

18. What is the name of physical network segment where data packets can collide with one another when being sent?
Collision domain
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable detect cause {all | {cause-name}}
In TCAM Value entries

19. Displays the CAM table size with number of MAC addresses
A name assigned to a ranges of interfaces
CEF glean
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

20. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
Half duplex
Switch(config)#errdisable detect cause bpduguard
Trunk

21. What is TCAM?
Ternary Content-Addressable Memory
Source MAC address; Port of arrival; VLAN; Time stamp
Compiling Access Control Entries (ACE) into the TCAM table
Process the first packet in a traffic flow to determine the destination

22. Enables error-disable for errors with dynamic ARP inspection
Cisco Express Forwarding
The adjacency table
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config)#errdisable detect cause arp-inspection

23. What is the standard for 1000BASE-T?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
IEEE 802.3ab
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Compiling Access Control Entries (ACE) into the TCAM table

24. What is the operational mode of a switch port that uses DTP negotiation?
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#mac address-table aging-time {seconds}
Static access or trunk
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

25. What is 10GBASE-CX4?
Trunk or dynamic
Full duplex
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Half duplex

26. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#mac address-table aging-time {seconds}
Enable error-disable for all possible causes
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

27. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Forwarding Information Base
Distributed CEF (dCEF)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

28. Adds a static entry to the MAC address table
Switch(config)#errdisable detect cause psecure-violation
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

29. Displays dynamic CAM table entries
Switch(config)#errdisable detect cause rootguard
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Native routed interface
Switch(config)#errdisable detect cause loopback

30. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable detect cause arp-inspection
Source MAC address; Port of arrival; VLAN; Time stamp
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

31. What is a SVI?
In TCAM Value entries
Switched virtual interface (SVI)
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Full duplex

32. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause gbic-invalid
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config)#errdisable detect cause {all | {cause-name}}
Trunk or dynamic

33. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable detect cause rootguard

34. What happens to subsequent packets destined for FIB entries in CEF glean state?
They are dropped (ARP throttling)
ANSI X3T11 FibreChannel
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Full duplex

35. What is FIB?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Process the first packet in a traffic flow to determine the destination
Forwarding Information Base

36. What is the default timer for automatic re-enabling of error-disabled ports?
The Punt adjacency
300 seconds
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#errdisable recovery interval {seconds}

37. Creates an interface-range macro
Configure the appropriate values manually on both ends of the link
The Layer 3 engine
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Down - static access - trunk or tunnel

38. What is 1000BASE-LX/LH?
IEEE 802.3ab
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
The Null adjacency
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

39. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
The CEF entry version number
Cisco Express Forwarding
SVI

40. What are the common cabling specifications for Fast Ethernet?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config-if)#shutdown
Switch#show errdisable detect
Switch(config)#errdisable detect cause udld

41. What are the reasons for packets being dropped by CEF?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Multilayer Switching

42. What is a ternary combination?

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43. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Static access - trunk - tunnel or dynamic
10GbE operates only at full duplex
400 metres half duplex and 2000 metres full duplex

44. What is the TCAM Value and Mask for an Ethernet access list?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Collision domain
15 metres
UTP Fast Ethernet and Gigabit Ethernet

45. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Configure the appropriate values manually on both ends of the link
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config-if)#speed {10 | 100 | 1000 | auto}

46. Adds a description to an interface configuration
Switch(config-if)#description {string}
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switch(config-if)#no switchport

47. What information is stored in CAM?
Tunnel
Cabling specifications for Gigabit Ethernet
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
The table of learned MAC addresses - ports - and VLAN information

48. What is the operational mode of a switch port that is a member of one VLAN?
Static access
Switch(config)#errdisable detect cause unicast-flood
Cabling specifications for Gigabit Ethernet
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

49. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
SC or MT-RJ
Switch(config)#errdisable detect cause gbic-invalid
Tunnel
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

50. What are the reasons for packets being punted by CEF?
Switch(config)#errdisable detect cause rootguard
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
IEEE 802.3u
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