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 the name of a Layer 3 physical interface on a switch?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Native routed interface
Switch(config)#errdisable detect cause arp-inspection
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

2. What is WWDM?
Wide-Wavelength Division Multiplexing
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable detect cause {all | {cause-name}}

3. What are GigaStack GBICs used for?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch#show errdisable recovery
The CEF epoch number
Switch(config)#no ip cef

4. What is 1000BASE-T?
SC or MT-RJ
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
When one station transmits at the same time as another on a shared medium
The Layer 3 engine

5. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
Switch(config)#errdisable detect cause dtp-flap
Numeric values that represent what action to take after the TCAM lookup occurs
Multilayer Switching

6. When can a switch start to learn source MAC addresses on incoming ports?
Switch(config)#errdisable detect cause security-violation
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
IEEE 802.3
Interconnecting switches in a campus network

7. What are the Fast Ethernet autonegotiation selection priorities?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable detect cause gbic-invalid
Collision domain
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

8. What is FIB?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Forwarding Information Base
Down - static access - trunk or tunnel
Electromagnetic Interference

9. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config-if)#shutdown
Institute of Electrical and Electronics Engineers

10. What two IOS software components are involved in TCAM operation?
Configure the appropriate values manually on both ends of the link
Feature Manager (FM) and Switching Database Manager (SDM)
In TCAM Value entries
Switch(config)#errdisable detect cause l2ptguard

11. How are the TCAM Mask/Value pairs evaluated?
In parallel revealing the best (longest) match in a single table lookup
Switch(config-if)#no ip route-cache cef
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#errdisable detect cause rootguard

12. What is the standard for 1000BASE-T?
Switch(config)#no ip cef
Switch#show interfaces {interface}
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
IEEE 802.3ab

13. What is the default timer for automatic re-enabling of error-disabled ports?
Value - Mask - and Result (VMR)
300 seconds
Creating the VLAN
Switch(config-if)#duplex {auto | full | half}

14. What is the maximum cabling distance for 1000BASE-SX?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
LAN PHY and WAN PHY
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switched virtual interface (SVI)

15. Displays switch port information for a specified interface
10 km
Switch#show interfaces {interface} switchport
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

16. Displays CEF adjacency table information
Switch#show adjacency [{interface}] [summary | detail]
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause rootguard
10 km

17. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause loopback
Switch#show interfaces status err-disabled
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

18. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
15 metres
ANSI X3T11 FibreChannel
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)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

19. What tables are maintained by the CEF Layer 3 engine?
Switch(config)#errdisable recovery interval {seconds}
Switch#show adjacency [{interface}] [summary | detail]
Switch#show interfaces {interface}
Routing table and ARP table

20. What CEF optimisation replicates the entire FIB table among switch line cards?
Switch(config)#errdisable detect cause pagp-flap
Compiling Access Control Entries (ACE) into the TCAM table
Switch(config)#errdisable detect cause dtp-flap
Distributed CEF (dCEF)

21. Enables error-disable for errors related to 802.1x security
Switch(config)#errdisable detect cause security-violation
Source MAC address; Port of arrival; VLAN; Time stamp
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
They are dropped (ARP throttling)

22. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Collision domain
Switch(config)#errdisable detect cause vmps

23. What is an interface-range macro?
Switch(config)#errdisable detect cause l2ptguard
Route caching and topology based
A name assigned to a ranges of interfaces
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

24. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
The adjacency table
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Accelerated CEF (aCEF)

25. 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)#interface vlan {vlan-id}
On
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

26. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

27. What function is performed by the Switching Database Manager (SDM)?
Switch(config)#errdisable detect cause udld
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
A switch port that has been shut down automatically due to a serious error condition

28. How are ternary combinations implemented?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause unicast-flood
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
With a mask value in addition to binary values to decide which keys in a table are relevant

29. What is 10GBASE-ER/EW?
Switch(config)#default interface {interface}
Switch#show interfaces {interface}
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
SC or MT-RJ

30. What is the name of the CEF engine that maintains routing information in software?
Switch(config)#errdisable detect cause link-flap
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
On
The Layer 3 engine

31. 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
Switch(config-if)#shutdown
Accelerated CEF (aCEF)
SC or MT-RJ

32. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
10 km
IEEE 802.3ae
Switch(config-if)#speed {10 | 100 | 1000 | auto}
S = Short; L = Long; E = Extra-long

33. What information is stored in TCAM?
Logical Operation Unit
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)#errdisable recovery cause {all | {cause-name}}
Security and QoS ACLs

34. Displays entries in the Forwarding Information Base (FIB) for a specific interface
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Accelerated CEF (aCEF)
Switch#show ip cef {interface} [detail]
Electromagnetic Interference

35. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
SC or MT-RJ
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
300 seconds

36. How are ports that are in error-disable state re-enabled by default?
When one station transmits at the same time as another on a shared medium
On
Manually by administratively disabling and re-enabling the port
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

37. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config-if)#description {string}
Forwarding Information Base
Tunnel

38. What is the role of a Route Processor (RP) in first generation MLS?
Switch(config)#interface {type}{module}/{number}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Slow response times - low throughput - runts and other input errors on the switch ports
Process the first packet in a traffic flow to determine the destination

39. Selects a switch port interface and enters interface configuration mode
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#interface {type}{module}/{number}
The Layer 3 engine

40. What is the maximum cabling distance for 1000BASE-ZX?
A name assigned to a ranges of interfaces
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switched virtual interface (SVI)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

41. What is 10GBASE-LX4/LW4?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch#show interfaces {interface}
Native routed interface

42. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch#show errdisable detect
CEF punt
Cisco Express Forwarding
IEEE 802.3ae

43. When should CEF be disabled?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
The Layer 3 engine
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
Only temporarily for debugging purposes

44. What is LOU?
In parallel revealing the best (longest) match in a single table lookup
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch#show adjacency [{interface}] [summary | detail]
Logical Operation Unit

45. Enables automatic re-enabling of error-disabled ports
A name assigned to a ranges of interfaces
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable recovery cause {all | {cause-name}}
R = LAN PHY; W = WAN PHY

46. 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)#interface {type}{module}/{number}
American National Standards Institute
Store-and-forward

47. Enables error-disable when trunking encapsulation is flapping from one type to another
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Static access
Switch(config)#errdisable detect cause dtp-flap
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

48. What is Fast EtherChannel (FEC)?
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
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

49. Displays the entire Forwarding Information Base (FIB)
Switch#show ip cef
From 30 seconds to 86 -400 seconds (24 hours)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Half duplex

50. What is the prerequesite for creating a working SVI?
A three-fold combination of 0 - 1 and X (don't care)
American National Standards Institute
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Creating the VLAN