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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 are the types of layer 3 switched interfaces
They are dropped (ARP throttling)
SVI or native routed interface
Half duplex
LOU registers

2. Disables CEF operation on an interface
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config-if)#no ip route-cache cef
Switch(config-if)#duplex {auto | full | half}
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

3. Enables error-disable for errors with offering inline power
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
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#errdisable detect cause ilpower
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

4. What is the original standard for Ethernet (10 Mbps)?
Dynamic
IEEE 802.3
The switch port falls back to default setting of half duplex
Cabling specifications for Gigabit Ethernet

5. What is the maximum cabling distance for 10GBASE-CX4?
Switch(config)#default interface {interface}
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
15 metres
Switch(config)#errdisable detect cause vmps

6. What are the reasons for packets being punted by CEF?
The Drop adjacency
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)
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

7. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Static access - trunk - tunnel or dynamic
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

8. What is the default timer for automatic re-enabling of error-disabled ports?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
A switch port that has been shut down automatically due to a serious error condition
Cabling specifications for Gigabit Ethernet
300 seconds

9. What is a GigaStack GBIC?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Cabling specifications for Gigabit Ethernet
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#no ip cef

10. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
The switch port falls back to default setting of half duplex
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show cef drop
Dynamic

11. Enables error-disable for conditions that trigger port security configured on a port
Switch(config)#errdisable detect cause security-violation
Switch(config)#errdisable detect cause psecure-violation
Ternary Content-Addressable Memory
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

12. What is 1000BASE-LX/LH?
Trunk
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Down - static access - trunk or tunnel
SC fibre optic or RJ-45 UTP

13. What combinations are TCAM entries composed of?
Cabling specifications for 10 Gigabit Ethernet
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Value - Mask - and Result (VMR)
Logical Operation Unit

14. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable detect cause bpduguard
Partition and tune the TCAM on some Catalyst switches into areas for different functions

15. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable recovery interval {seconds}
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Partition and tune the TCAM on some Catalyst switches into areas for different functions

16. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
SVI
Switch#show errdisable detect

17. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#no ip cef
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

18. Displays a list of all interfaces in an error-disabled state
Switch(config)#errdisable detect cause pagp-flap
40 km
Switch#show interfaces status err-disabled
Cabling specifications for 10 Gigabit Ethernet

19. What are the common cabling specifications for Gigabit Ethernet?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
The Drop adjacency
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

20. Displays static CAM table entries
Switch(config-if)#duplex {auto | full | half}
Process the first packet in a traffic flow to determine the destination
R = LAN PHY; W = WAN PHY
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

21. What is CSMA/CD?
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
Carrier Sense Multiple Access Collision Detection
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#show running-config interface {interface}

22. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
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
When one station transmits at the same time as another on a shared medium
Store-and-forward
Numeric values that represent what action to take after the TCAM lookup occurs

23. What is full duplex operation?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switch#show errdisable recovery
The Punt adjacency
From 30 seconds to 86 -400 seconds (24 hours)

24. What is the DTP negotiation mode of a switch port configured as dynamic?
On
Switch(config-if)#duplex {auto | full | half}
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch#show errdisable detect

25. What Ethernet ports allow for autonegotiation?
UTP Fast Ethernet and Gigabit Ethernet
25 metres
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
On

26. Enables error-disable when trunking encapsulation is flapping from one type to another
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config-if)#shutdown
Switch(config)#errdisable detect cause dtp-flap
Native routed interface

27. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause pagp-flap
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-if)#speed {10 | 100 | 1000 | auto}

28. Displays error-disabled detection status
Full duplex
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
LAN PHY and WAN PHY
Switch#show errdisable detect

29. What is the DTP negotiation mode of a switch port configured as static access?
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable detect cause gbic-invalid
Off
IEEE 802.3u

30. What connectors can be used with GBIC modules?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
SC fibre optic or RJ-45 UTP

31. What is CEF?
IEEE 802.3
A name assigned to a ranges of interfaces
Cisco Express Forwarding
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

32. What is the maximum cabling distance for 1000BASE-ZX?
In TCAM Value entries
SVI or native routed interface
70 km for 9 micron SMF; 100 km for 8 micron SMF
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

33. What is 100BASE-T4?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#errdisable detect cause udld
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

34. What is the maximum cabling distance for 1000BASE-LX/LH?
Packets that have been truncated before they were fully received
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

35. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Cisco Express Forwarding
Switch#show ip cef {interface} [detail]
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#errdisable recovery interval {seconds}

36. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
UTP Fast Ethernet and Gigabit Ethernet

37. What is FIB?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
IEEE 802.3ae
Packets that have been truncated before they were fully received
Forwarding Information Base

38. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

39. What is 1000BASE-X?
Cabling specifications for Gigabit Ethernet
Multilayer Switching
Distributed CEF (dCEF)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

40. Enables error-disable for errors with dynamic ARP inspection
Switch#show cef drop
Switch(config)#errdisable detect cause arp-inspection
Wide-Wavelength Division Multiplexing
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

41. Enables error-disable for rate-limiting of DHCP snooping
Configure the appropriate values manually on both ends of the 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
Switch(config)#errdisable detect cause dhcp-rate-limit
A station must wait its turn to transmit; it can't transmit and receive at the same time

42. What is 10GBASE-LR/LW?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
The CEF epoch number
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
10GbE operates only at full duplex

43. What is 10GBASE-X?
The Drop adjacency
Switch(config)#errdisable detect cause unicast-flood
Cabling specifications for 10 Gigabit Ethernet
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

44. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
R = LAN PHY; W = WAN PHY
Cabling specifications for 10 Gigabit Ethernet
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
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

45. Displays dynamic CAM table entries
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable recovery cause {all | {cause-name}}
Tunnel

46. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
CEF punt
LC - MT-RJ or RJ-45
Switch#show errdisable detect
By Mask/Value - where each unique mask has eight value patterns associated with it

47. What function is performed by the Feature Manager (FM)?
Compiling Access Control Entries (ACE) into the TCAM table
American National Standards Institute
1000BASE-T full duplex followed by 1000BASE-T half duplex
Only temporarily for debugging purposes

48. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
10 km
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
Routing table and ARP table
Store-and-forward

49. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Switch(config)#errdisable detect cause vmps
The Drop adjacency
Switch(config)#errdisable recovery interval {seconds}
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

50. What CEF optimisation replicates the entire FIB table among switch line cards?
FIB with adjacency table
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
IEEE 802.3z
Distributed CEF (dCEF)